Sorting these covers by decade
Green Eggs and Ham by decade
Dr. Seuss
21 covers from 23 printings with a known year, 2010s back to 1960s
2010s
4 covers · 2 of 4 printings say paperback · 4 publishers, French and European Publications Inc and HarperCollins Children's Books among them · 2 languages
2000s
5 covers · 4 publishers, Random House Books for Young Readers and Scholastic, Inc. among them · 2 languages
1990s
5 covers · 3 of 6 printings say other · 6 publishers, Random House Books for Young Readers and HarperCollins Children's Books among them · 2 languages
1980s
4 covers · 4 of 6 printings say hardcover · 6 publishers, Beginner Books (Div of Random House, Inc.) in Canada by Random House of Canada, Ltd. and Random House Books for Young Readers (Div. of Random House, Inc.), In Canada by Random House of Canada, Ltd. among them
1960s
2 covers · 2 of 2 printings say hardcover · 2 publishers, Random House and Beginner Books, Div of Random House, Inc. among them
No year on record
1 cover
Covers from Open Library, each in the decade of the earliest printing that carries it. What the catalogues never scanned is missing here too. See the whole wall.