"Three small books in which I took notes during field trips. Many of these notes were later ripped from the booklets and pasted into the larger preceding notebooks. I carried one of these three with me wherever I went, so they contain a fearful hodgepodge of stuff, all of it of interest to me when I took it down. 2.C, the green book, contains also the brief notes I took of the long meetings Albert Erskine and I held in August through October, when we were revising the manuscript and shortening it. Sometimes six lines of notes would require me to work six days."