Update! Now covered in material that closely resembles the original leather.
Company Morning Report Book These books are made to the standards as stated in paragraph 127 of Revised U. S. Army Regulations, which states:127. The following books are allowed to each company: one descriptive book, one clothing book, one order book, one morning report book, each one quire, sixteen inches by ten. In the Morning Report book, a daily record of attendance was kept. The book contains 12 sets of 4 pages, 1 set for each month of a year. The first two pages contain the detailed attendance numbers of present, sick, absent, and so forth for each day of a month. The second set of pages are for daily notes explaining why the number differ from day to day.
A Personal Note - I have used one of these to keep track of unit attendance at events, and notes about the weather for events or other points that I thought should be noted about a particular event. Hardbound.