The are many databases and websites that offer information on Hispanic and Afro-Latino Heritage. Check some of the ones listed below. 
If you would like to research this topic further, there are several great databases where you can look up the history and heritage of many different peoples of Hispanic and Afro-Latino decent.
CREDO contains all kinds of reference books including encyclopedias, dictionaries, quotations, and subject-specific titles from some of the top university presses in the United States. It also includes over 200,000 images and audio files and over 1200 videos.
A scholarly, multi-disciplinary database providing indexing and abstracts for thousands of journals and other publications. Academic Search Complete includes full-text access to peer-reviewed journals, as well as indexing and abstracts for magazines, monographs, reports, and conference proceedings.
There are many interesting online sources where you can find information the ways in which those of Hispanic heritage have contributed to the United States, California, and Napa County. Here is a sample of some of these.
There are a number of newspaper, magazine, and journal articles that highlight the history of Hispanic and Afro-Latino heritage in Napa, California, and the United State. Here are some suggested ones that folks might fight interesting to read.