This firm published three Rollo first editions.
6. Rollo Vacation, 1839
9. Rollo's Travels, 1840
10. Rollo's Correspondence, 1840

Book #6 Vacation was copyrighted by T.H. Carter in 1838. Books #9 and #10 were copyrighted by T. H. Carter in 1839.

All three books are 6.5 x 4.25. Several blind stamped cover patterns have been seen. No known priority is recognized at this time.

It appears that Crosby only published these three Rollo titles.