The regimental books of the 24th New York Cavalry consist of two bound volumes held at the National Archives in Washington, DC. These volumes were created by the regiment during the war. One volume contains the "morning reports" for companies B and I.  The other is called the "Descriptive Book." The Descriptive Book contains a wealth of information on each of the men who served in companies B, F, I, K, L, and M. Although it is labeled "A-M" on the spine, the book does not cover the other companies. The missing information, however, can be reconstructed from other sources.  One such alternative source is the regimental books for the 1st Provisional New York Cavalry.  On June 17, 1865, shortly before the men were mustered out of service, the 24th New York Cavalry and the 10th New York Cavalry were consolidated together into the 1st Provisional New York Cavalry.  Each company was integrated into the corresponding company of the other regiment.  The National Archives appears to possess complete regimental books for the 1st Provisional New York Cavalry.  These books do not indicate which regiment the individual men belonged to originally (24th or 10th) but using information from other sources it is generally possible to determine this.

So far, I have abstracted all the information concerning the men of Company "M."   Over time, I hope to do the same for the remaining companies.

Update:  This past summer (2005) I took high-resolution digital photos of every page in the Regimental Books for both the 24th New York Cavalry and the 1st Provisional New York Cavalry.  I will be happy to look up individual soldiers in these records upon request.  I will also consider sending digital images of the pertinent records.