@ ppint. I have a copy of this (added back cover scan) and per your question about Canadian printing, the copyright page confirms a Canadian printing simultaneous to the American (my copy is U.S. - and autographed by Anderson, too). Book was incorrectly listed under Non-fiction; submitted correction to Fantasy.
cover art by mara mcafee (unsigned, credited)
cover price $1.95
304pp. (check) including titles, indicia, table-of-contents etc. end pp.advertising
collection of four short stories, three novelettes, two novellas, nine author's notes and an introduction by poul anderson, and an introduction by the editor, barry n. malzberg.
may well also exist in canadadian printing (if seen, please post data from this to bookcat here).
near-identical separate second canadadian and second merkin printings sharing this cover art, new isbn (0-671-83140-2) bear different cover prices, $2.25 and $2.50 respectawigglily, noted in indicia by number "1" being dropped from number line now 10 9 8 7 6 5 4 3 2, and statement of country of printing
recollecting anderson (nf introduction) barry n. malzberg (1976)
introduction (nf) poul anderson (1976)
introduction (1976)
the longest voyage (novelette) analog vol. lxvi #4, 12/1960; atlas bre vol. xvii #4, 4/1961; both:
the cover story, & four b+w illustrations, by john schoenherr
introduction (1976)
the barbarian (ss) f&sf vol.10 #5, 5/1956 (the only fantasy story in this collection)
introduction (1976)
the last of the deliverers (ss) f&sf vol.14 #2, 2/1958; f&sf atlas bre vol.1 #3, 2/1960
introduction (1976)
my object all sublime (ss) galaxy vol.19 #5, 6/1961, two b+w illustrations by dick francis; thorpe & porter bre #86, 6 or 7/1961
introduction (1976)
sam hall (ntte) astounding vol. li #6, 8/1953; atlas bre vol. x #1, 1/1954; both: with three b+w illustrations by stockwell
introduction (1976)
kyrie (ss) in ''the farthest reaches'' ed. joseph elder (1968), q.v.
introduction (1976)
the fatal fulfillment (novella) f&sf vol.38 #3, 3/1970
introduction (1976)
hiding place (nlla) analog vol. lxvii #1, 3/1961, with four b+w illustrations by john schoenherr; atlas bre vol. xvii #7, 7/1961 (a nicholas van rijn series story in the polesotechnic league universe)
introduction (1976)
the sky people (ntte) f&sf vol.17 #3, 3/1959 (a maurai story in the polesotechnic league universe)
f&sf atlas bre vol.1 #1, 12/1959 (this comment is from another edition of this book)
simon & schuster pocket books imprint mmpb simultaneous second printings by printing number line°
reprint collection of two novellas, three novelettes, and four short stories (one fantasy)
each is preceded by an nf introductory essay/note of up to two pages by the poul anderson:
there is thus rather more non-fiction by poul anderson in this book, than fantasy.
cover art by mara mcaffee (unsigned, uncredited, retained from pocket books mmpb first edition)
cover price $2.50 canadian-carcassed copies intended for distribution north of the parallel
cover price $2.25 wholly merkin-printed copies for general distribution
304pp. (check) including titles, indicia, nf introduction by barry n. malzberg etc, end pp.
refer to indicia publishing history to see if carcass of copy held was canadian- or merkin- printed
no priority established nor liable to be°; canadian-carcassed copies bear white maple leaf symbol on front cover
° - date of second printings not given; taken from locus 225, 9/1979 (this comment is from another edition of this book)