The book was first published by Julian Messner in 1936 under the title Black Sheep.
Typically the Export edition is abridged - about 30% shorter than the Harlequin. The back cover blurbs are nearly identical - both maybe lifted from the Star Guidance book.
News Stand Library 133 - September 1950
News Stand Library 133 back
Harlequin 281 - March 1954
Harlequin 281 back