CA 12-13 Handwritten letter from Schenker to Cotta, dated February 5, 1906

Schenker discusses the pros and cons of placement of music examples in Harmonielehre and of the captions; he asks to receive in future galley-proofs.

CA 15 Handwritten letter from Schenker to Cotta, dated February 15, 1906

Covering letter enclosing sheets and examples.

CA 16 Handwritten letter from Schenker to Cotta, dated February 26, 1906

Covering letter enclosing manuscript pages and music examples, and summarizing the state of play.

OJ 9/31, [7] Stenographically handwritten letter from Cotta to Schenker, dated February 7, 1906

Cotta will in future send galley-proofs.