Folder 12 contains two legends to the correspondence. The first legend contains brief descriptions of the content of each letter. The second legend contains the salutation, location, date, and signature of each letter as well as notes regarding how the letter was written (e.g. typescript, handwritten) and on what type of paper. Folders 13-21 comprise correspondence in the order as listed in the second legend. Folder 22 contains miscellaneous Gerber writings. Folder 23 contains copies of letters Gerber wrote to various periodicals. Folder 24 contains duplicate copies of letters. Although the folders have new box and folder numbers in the upper righthand corner, the original folder numbers as listed in the second legend (ex. f4, f5, f6, etc...) have been retained on the folders for identification purposes. Note that folders 22 and 23 have original folder numbering which is not represented in the second legend. Folders 12 and 24 have no original folder numbering.