Hardcover Lunar Module simulator log book, 5 x 6.25, filled in a Grumman technician’s hand, documenting Conrad’s time in the lunar module simulator. The log was presented to Conrad by Grumman. Log shows 149 individual training sessions in the Lunar Module simulator from February 15, 1967, to October 13, 1969. Each page provides the date of training; the vehicle type and number; mission description, mostly “Mission Sim”; as well as the time, with the total hours logged being 612 hours and 40 minutes. Front of the book features a presentation page to Conrad from Grumman Aircraft and is signed along the top of the page in black ink by Conrad. Accompanied by a handwritten letter of authenticity from Conrad which reads, “This LM Log Book was maintained by the Grumman Aircraft Corporation and was given to me to show the amount of simulator and actual LM test time that I spent in the vehicles. However, it is incomplete with respect to the Apollo XII LM-6 because it does not show any of the LM-6 test runs that we made. It also doesn‘t show the last LMS-2 trng.” In very fine condition. An outstanding, and very detailed, example of the time commitment Conrad made in order to perform his duties as commander of Apollo 12.