There is a wealth of knowledge out there for the topic of reconnaissance and surveillance.
“Reconnaissance is concerned with three components: enemy, weather, and terrain. You should understand that reconnaissance is active; it seeks out enemy positions, obstacles, and routes. Since movement draws attention, good reconnaissance uses stealth to avoid detection.
Surveillance is passive. Surveillance implies observing a specified area or areas systematically from a fixed, concealed position. A good R&S plan contains the best mix of R&S based on requirements, assets available, and the threat.” -FM 34-2-1
The MV Tactical Manual is excellent and I highly recommend that.
It mirrors what 1SG taught during the first day of the recce course, but in a much more watered down way. It would make a great primer or refresher for the course, but not a replacement. The only place that I saw divergence from 1SG’s lectures was avoiding hot meals due to the fire needed. Likely this is due to the book not touching on modern heating techniques, like MRE heating elements or solid fuel stoves.