Hardcover copy of "The Bobbsey Twins in the Mystery Cave" by Laura Lee Hope, published by Grosset & Dunlap in 1960. The illustrated dust jacket depicts the twins in a yellow raft inside a cave, with both front and spine cover art visible.
The copyright page confirms the 1960 publishing date. The book features illustrated endpapers with nautical motifs and a green top edge. The interior includes a full table of contents listing eighteen chapters. The back cover features promotional content for other children's series.
Dust jacket and pages show minor signs of shelf wear and age. See photos for Measurements if Measurements were taken.