Suanfa tongzong (General Source of Computational Methods) is a mathematical text written by sixteenth century Chinese mathematician Cheng Dawei (1533–1606) and published in the year 1592.
 The book contains 595 problems divided into 17 chapters.
 The book is essentially general arithmetic for the abacus.
 The book was the main source available to scholars concerning mathematics as it developed in China’s tradition.
 Six years after the publication of Suanfa Tongzong, Cheng Dawei published another book titled "Suanfa Zuanyao" ("A Compendium of calculating Methods").
 About 90% of the content of the new book came from the contents of four chapters of the first book with some rearrangement.
 It is said that when Suanfa Tongzong was first published, it sold so many copies that the cost of paper went up and the lucrative sales resulted in unscrupulous people beginning to print pirated copies of the book with many errors.
 it was this that forced the author to print an abridged version.
Henry Huggins is a character appearing in a series of children's literature novels by Beverly Cleary, illustrated by Louis Darling, and first appearing in "Henry Huggins".
 He is a young boy living on Klickitat Street in Portland, Oregon.
 In the novels, he is in elementary school.
 The novels take place in the 1950s, which is when Cleary wrote most of the books.
 The books describe adventures that he experiences in his neighborhood and his interactions with other neighborhood children.
 He has a dog named Ribsy and a part-time job doing a paper route in North Portland.
Popular Soviet Songs and Youth Music is the sixth album by the British avant-garde music group :zoviet*france:, who, when it was recorded, identified themselves as :zoviet-france:.
 Recorded in 1984 and 1985, it was first released in 1985 by the band's label Singing Ringing in collaboration with Red Rhino in double cassette format.
 The packaging was elaborate and very labour-intensive to create; the cassettes sat inside a sculpted, clear-glazed ceramic box with a short length of twine with a hand-painted stick on the end sticking out of the bottom.
 A seabird feather gathered from the beach at Seascale (one mile from the Sellafield nuclear reactor) was stuck through a hole in each side of the box, held in place with sealing wax, which held the cassettes in.
 The inserts included a parody of the American flag (with mini-hammer and sickles in place of the stars) silk-screened on muslin, a piece of paper with art silk-screened on it, and a professionally printed sheet of paper with the track list and various sets of instructions for use of the package in English, Spanish and French, with most of them obviously being jokes ("Remove feather by melting wax seal.
 Discard burnt cassettes.
 Retain box.")
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 Staalplaat re-released it in triple CD format in 1994, with other editions in 1995 and 2004.
 These were packaged between two round felt pieces cut from black market Red Army caps, and held together with a Soviet military pin.
 The design on the front cover piece is by E. Van Weelden.
 The first edition was problematic; the intent was to sandwich the music CDs between CDs with tones on the play side and felt glued on the label side, but many copies wound up with the music CDs having the felt glued on them.
 The second and third editions don't have the tone CDs or the glued-on felt.
Henry and the Clubhouse, by Beverly Cleary, is the fifth book in the humorous children's series about Henry Huggins.
 Now that he has the paper route he wanted so badly in the previous book, Henry finds that it's harder than he expected.
 His earnings are going for the clubhouse he and his friends are building.
 One of the boys insists that it be a "Boys Only" club, and that causes trouble with Henry's friend Beezus Quimby and her little sister Ramona.
 "Henry and the Clubhouse" was published in 1962.
Henry and the Paper Route is a book that was written by Beverly Cleary and illustrated by Louis Darling.
 It was written in 1957 and focused on the main character Henry Huggins' attempts to get a paper route, despite his young age.
Letterpress printing is a technique of relief printing using a printing press, a process by which many copies are produced by repeated direct impression of an inked, raised surface against sheets or a continuous roll of paper.
 A worker composes and locks movable type into the "bed" or "chase" of a press, inks it, and presses paper against it to transfer the ink from the type which creates an impression on the paper.
The newsvendor (or newsboy or single-period or perishable) model is a mathematical model in operations management and applied economics used to determine optimal inventory levels.
 It is (typically) characterized by fixed prices and uncertain demand for a perishable product.
 If the inventory level is formula_1, each unit of demand above formula_1 is lost in potential sales.
 This model is also known as the "Newsvendor Problem" or "Newsboy Problem" by analogy with the situation faced by a newspaper vendor who must decide how many copies of the day's paper to stock in the face of uncertain demand and knowing that unsold copies will be worthless at the end of the day.
Portrait of Henry VIII is a lost work by Hans Holbein the Younger depicting Henry VIII.
 It was destroyed by fire in 1698, but is still well known through many copies.
 It is one of the most iconic images of Henry and is one of the most famous portraits of any British monarch.
 It was originally created in 1536–1537 as part of a mural showing the Tudor dynasty at the Palace of Whitehall, London.
Beverly Atlee Cleary (née Bunn; born April 12, 1916) is an American writer of children's and young adult fiction.
 One of America's most successful living authors, 91 million copies of her books have been sold worldwide since her first book was published in 1950.
 Some of Cleary's best known characters are Henry Huggins and his dog Ribsy, Ramona Quimby and Beezus Quimby, and Ralph S. Mouse.
The Burning Red is the third album by the American groove metal band Machine Head.
 It is the band's second best selling album in the US, selling as many copies in three years as "Burn My Eyes" sold in almost eight years (1994–2002) .
 The album has sold over 134,000 copies in the US and it was certified silver in 2011 by the BPI for sales of 60,000 in the UK.

Question: Henry and the Paper Route was written by the author who has sold how many copies of her books?
Answer: 91 million