Series II. Notebooks originally consisted of eight loose-leaf binders numbered I to VIII, containing sheets of bird sightings by bird. The original order of the notebooks and of the sheets in the notebooks has been retained in the folders. Each sheet contains the name of a particular bird with the date, place, and number of Griscom's sighting of that bird in chronological order, generally from 1907 to 1955, although a few earlier sightings are listed.

Volumes I through IV of the notebooks contain North American birds listed in A.O.U. check list order (circa 1955). Volumes VI though VIII contains birds not found or not commonly found in the Northeast. There are deviations from systematic order in these three volumes (for a list of birds in the notebooks, see Appendix II.)