Collection Petit Format (CPF) was a mass market imprint published by Les Editions Moderne Ltee of Montreal from 1944 to 1958. During the fifteen years 443 books were published. Only 27 were published 1944-1948 with 416 published from 1949 to 1958. The years and number of books have an English Canada counterpart - Harlequin Books of Toronto. From 1949 until 1959 Harlequin published 477 titles with only romance (with a handful of exceptions) after 1959. Here is the only science fiction title in the series plus volume 2 of Les milles et une nuits. L'ile du savoir is a paperback original.