Grosset and Dunlap. #2 in the series.  Original copyright 1907 as The Bobbsey Twins in the Country. Revision/update 1950. Complete rewrite 1961 as The Bobbsey Twins' Adventure in the Country. Print Run 1961 or later.

This book is 1960s vintage, the complete rewrite. 18 chapters, 179 pages. Plain line frontispiece and internal illustrations.

Green tweed book in very good and clean condition. Brown/white toy endpapers.  Green-ink top page block.

Dust jacket has some edgewear and corner bumping, but is overall nice-looking. Front dust jacket flap has "100100" and "70-100" designations. lists to In the Mystery Cave (1960), just under the complete rewrite wire.

There's a childhood memory of the Bobbseys in one form or another for everyone who had a childhood in between 1904 and 1979, the span of the series. 

Try reading one to pre-schoolers or early grade school students. You'll find they'll expand their vocabulary and imagination, because these books were not badly plotted and written compared to today's children's literature!