publisher: Dover Pubns
publish date: June 1st 1970
format: paperback pages: 44
ISBN:
0486224147 (9780486224145)
publisher: Henry Holt & Company
format: hardcover pages: 32
language: English
ISBN:
0030156963 (9780030156960)
publisher: Henry Holt & Company, Inc. publish date: June 1974
format: library binding
ISBN:
0030157013 (9780030157011)