What information does Hathcock detail in his Sniper's Log as noted in the biography, Marine Sniper?

Hathcock carries a dog-eared, green notebook which he referrs to as his "sniper log". He uses the log to jot down facts and incidents related to this work as a sniper. The sniper log is used to complete official reports. The sniper Apache is also noted as constantly referring to her sniper log, constructed from discarded American artillery containers.