"Aircraft Recognition" (S82) by R. A. Saville-Sneath, was a bestseller. In 1940, the children's imprint Puffin Books began with a series of non-fiction picture books; the first work of children's fiction published under the imprint was Barbara Euphan Todd's "Worzel Gummidge" the following year. Another series that began in wartime was the "Penguin Poets": the first volume was a selection of Tennyson's poems (D1) in 1941. Later examples are "The Penguin Book of Modern American Verse" (D22), 1954, and "The Penguin Book of Restoration Verse" (D108), 1968. J. M. Cohen's "Comic and Curious Verse" appeared in three volumes over a number of years.