Reddit reviews Sibley Birds West: Field Guide to Birds of Western North America

This is my wheelhouse! I have shelves and shelves of reference books.

My favorite Yellowstone reference (and free!!!) - 2016 Yellowstone Resource Guide. Has chapters on geography, geology, history, flora, fauna, and all the big issues faced by Yellowstone.

Birds -I'm a Sibleys fan. It fits nicely in your pocket and illustrations are exquisite. It takes longer to find birds if you are not used to the format of organized-by-family, but ultimately that's for the best because color is variable.

Insects - Butterflies and Moths of Grand Teton and Yellowstone

Plants - Plants of Yellowstone and Grand Teton

Reptiles - other than wandering garter snakes, you will not see any reptiles in Yellowstone except for the small percentage of the Park that is below 6000' in elevation

Sibley is the gold standard, though some people prefer Peterson's or National Geographic. I personally prefer the illustrations in Sibley - and in general, illustrated guides are better than photographic ones at showing a generic bird of its species, so you don't get hung up on the details of individual variation.

If you don't get out east much, all you're likely to need is the Sibley guide to Western birds, but there's also an eastern edition, as well as a book covering all of North America.

It you want get to know our local thrushes, Sibley's Western Field Guide would be an excellent place to start.

The Cornell Lab of Ornithology put together a review in 2013 of their recommended binoculars for a few different price ranges. Audubon has their own reviews, too.

If by "northwest", you mean "North America, west of the Rockies" then Sibleys West is a fine bird guide. But some prefer the National Geographic guide, Peterson's, or others.

Can't help you with logbooks, I'm afraid. I just write lists of birds sighted in a regular notebook. You can also log them online, where other people can see them and the data are available to scientists to study.