The National Sports Collectors Convention is the largest, annual trade show held in the United States devoted to sports memorabilia.
 Also known as The National, the convention has been held annually since 1980 when a small handful of sports card collectors convened at a hotel located adjacent to the Los Angeles International Airport.
 The show changes location each year to allow people from all areas of the country to participate.
 The show also changes the autograph signers each year.
Collectors Universe Inc. (NASDAQ: CLCT ) is an American company formed 1986, now based in Santa Ana, California, which provides third-party authentication and grading services to collectors, retail buyers and sellers of collectibles.
 Its authentication services focus on coins, trading cards, sports memorabilia, and autographs.
 The company reached the combined total of 50 million certified collectibles in early 2014.
 Collectors Universe is also a publisher in fields relating to collecting.
The Reader's Digest Condensed Books were a series of hardcover anthology collections, published by the American general interest monthly family magazine "Reader's Digest" and distributed by direct mail.
 Most volumes contained five (although a considerable minority consisted of three, four, or six) current best-selling novels and nonfiction books which were abridged (or "condensed") specifically for "Reader's Digest".
Story Paper Collectors' Digest was a journal published from November 1946 until May 2005, and with special intermittent issues continuing on until late 2007.
 It was created by Herbert Leckenby.
 With articles on story papers, it heavily featured the work of Charles Hamilton, Edwy Searles Brooks and the tales of Sexton Blake.
 It was published monthly until 2004 .
 The editors were Herbert Leckenby until his death in October 1959, then Eric Fayne until January 1987 when he retired as editor, then Mary Cadogan.
Football Digest was a sports magazine for fans interested in professional American football, with in-depth coverage of the National Football League (NFL).
 The magazine modeled the "Reader's Digest" idea, to bring the best in football journalism from newspapers and magazines that the fans would have otherwise not had an opportunity to read.
The Family Handyman is an American home-improvement magazine, owned by Trusted Media Brands, Inc.
Sports Collectors Digest (SCD) is an American advertising weekly paper published at Iola, Wisconsin.
 The magazine provides an avenue through which sellers, traders and avid buyers of sports memorabilia may interact.
The Billington family is a British family of English nationality which has had a long history in England as state employed executioners as well as several members who ventured into the world of combat sports and professional wrestling.
 Two of the family's sports oriented members would go on to marry into the Canadian Hart wrestling family.
Reader's Digest is an American general-interest family magazine, published ten times a year.
 Formerly based in Chappaqua, New York, it is now headquartered in Midtown Manhattan.
 The magazine was founded in 1920, by DeWitt Wallace and Lila Bell Wallace.
 For many years, "Reader's Digest" was the best-selling consumer magazine in the United States; it lost the distinction in 2009 to "Better Homes and Gardens".
 According to Mediamark Research (2006), "Reader's Digest" reaches more readers with household incomes of $100,000+ than "Fortune", "The Wall Street Journal", "Business Week", and "Inc." combined.
The family of Colt Pocket Percussion Revolvers evolved from the earlier commercial revolvers marketed by the Patent Arms Manufacturing Company of Paterson, N.J.
 The smaller versions of Colt's first revolvers are also called "Baby Patersons" by collectors and were produced first in .24 to .31 caliber, and later in .36 caliber, by means of rebating the frame and adding a "step" to the cylinder to increase diameter.
 The .31 caliber carried over into Samuel Colt's second venture in the arms trade in the form of the "Baby Dragoon"-a small revolver developed in 1847–48.
 The "Baby Dragoon" was in parallel development with Colt's other revolvers and, by 1850, it had evolved into the "Colt's Revolving Pocket Pistol" that collectors now name "The Pocket Model of 1849".
 It is a smaller brother of the more famous "Colt's Revolving Belt Pistol of Naval Caliber" introduced the same year and commonly designated by collectors as the "1851 Navy Model" (and which was a basically a larger, .36 caliber of the Pocket Model, "belt pistol" referring to a weapon sized to fit into a belt holster, as opposed to the saddle holsters generally called for by Colt's larger cavalry combat models).
 In 1855 Colt introduced another pocket percussion revolver, the Colt 1855 "Sidehammer", designed alongside engineer Elisha K. Root.

Question: Sports Collectors Digest and The Family Handyman, are of which nationality?
Answer: American