UPDATE:

SO I went here: http://freecruisingguides.com/

There are number of guides here for all over the world.

There is a newer V2.0 guide to Puerto Rico. This is called:

"A Cruising Guide to Puerto Rico", 2.0, by, Frank Virgintino

It is 37MB in size and 216 pages.

Page down to find the link.

I downloaded it and virus checked it, and it seems ok.

YMMV.