Saguaro National Park

A thorough guide to Saguaro National Park and the nearby Santa Catalina Mountains.  This guide has pages dedicated to 28 trails and 5 scenic drives.  It also has a great introduction to the area's natural history, flora, and fauna.  Lastly it has a section dedicated to places to visit in Tucson.  The best guide to the area.

https://amzn.to/4t8tY5N

Great map focused on the park and its immediate vicinity.

https://amzn.to/4b9mqd5

This book covers all of the national parks and monuments in Arizona.    https://amzn.to/4bFr0zQ

These small hiking guide books are always a great resource for a beginner level hikes in an areas. 

https://amzn.to/40ZThLo

This is a great book on the namesake species of the park.  It covers biological, ecosystem, and cultural aspects of this iconic cactus.

https://amzn.to/4uIKzyW

A solid reference guide to the geology, human habitation, plants and animals  of the area. 

https://amzn.to/4rzJTJ7

This is a more comprehensive guide to the plants of the entire state.  Given the range of ecological zones in the Rincon Mountains, it is a good guide that covers multiple ecological zones.

https://amzn.to/4uqWYam