This large multi-authored series of reprints differs from the Boys' Popular Library by its larger number of volumes. The juvenile book titles are also different between the two series. Lounsberry, Standish, Merriwell, Alger (different titles), Ellis, etc. Originally these books were in the Street and Smith Boys Popular Series. Federal used the same plates to publish its series. How and why Federal obtained the Street and Smith plates is unclear. Also unclear is the exact number of books published in this series as advertisements list different books. Here are several examples of the covers.