If you are a beekeeper in the Bay Area or coastal California, this book is required reading. All other beekeeping books are written for a climate with hot summers, warm nights, and below-freezing winters with snow. This one has "our" climate which includes mild winters where the bees fly every day and cold, foggy days in summer.
This book goes month by month with what to do in your hive. It also has a list of the major pollen and nectar sources for each month. At the end is an alphabetical list with photos of those pollen/nectar plants/trees.