Ayer y hoy
By: por J.P. Leventhal ; ilustraciones de Tibor Gergely
Contributors: Gergely, Tibor, 1900-1978
Series: Pequeño libro de oro -- N-21; Pequeño libro de oro -- N-21.
Publisher: Editorial Novaro-México
Published: 1959
Place of publication: México
Language: spa
Number of pages: 24
Subjects: Paleontology; Juvenile literature; Animals
Work titles: From then to now
Notes: Originally issued as v. 201 of Little golden books.