"the wheels of if" was also published as half a popular library double mmpb, "the virgin & the wheels" (1976), q.v.
and again, as half a tor books "tor double" series mmpb (1990) together with
"the pugnacious peacemaker", an authorised sequel novella by harry turtledove, q.v.
preface (nf) l. sprague de camp (original to the collection)
the wheels of if (novella) unknown worlds vol. iv #2, 10/1940
the best-laid schemes (short story) astounding vol. xxvi #6, 2/1941, a b+w illustration by ed cartier
the warrior race (ss) astounding vol. xxvi #2, 10/1940
hyperpelosity (ss) astounding vol. xxvi #2, 4/1938 as "hyperpilosity"
the merman (ss) astounding vol. xxii #4, 12/1938, the cover story, art & a b+w illustration by charles schneeman
the contraband cow (ss) astounding vol. xxix #5, 7/1942, a b+w illustration by william augustin kolliker
the gnarly man (novelette) unknown worlds vol. i #4, 6/1939, a b+w illustration by ed cartier
berkley publishing group berkley medallion mmpb first printing, first p/b edition
(the first edition is/was the shasta h/cvr (1949), q.v.)
reprint collection containing five short stories, a novelette and a novella, with nf introduction by the author.
cover art unsigned, uncredited; it is almost certainly by paul lehr (on stylistic grounds, & the date)
cover price 75¢
192pp? including titles, indicia etc.
the number in the isbn10 field is the sbn given in the indica.