Here is a compilation of free online resources that will help you find additional geospatial data, species information, and publications about Puerto Rico and the US Virgin Islands.
 
Geospatial Data:

Seamless Data Warehouse – http://seamless.usgs.gov/
The Seamless Data Warehouse provides free downloads of Digital Elevation Models, other USGS datasets, The National Map data, and Earth Resources Observation and Science (EROS) datacenter satellite imagery and aerial photographs.

National Hydrography Dataset – http://nhd.usgs.gov/
The National Hydrography Dataset (NHD) is the surface water component of The National Map. From their website you can download vector datasets that contain features such as lakes, ponds, streams, rivers, canals, dams, and streamgages for the United States and its territories, including Puerto Rico and the US Virgin Islands.

NRCS Soil Data Mart – http://soildatamart.nrcs.usda.gov/
The Soil Data Mart is the U.S. Natural Resources Conservation Service (NRCS) online soils download center where you can download soils geospatial layers and tabular data of the United States, including its territories.

USFWS National Wetlands Inventory – http://www.fws.gov/wetlands/
The U.S. Fish and Wildlife Service’s National Wetlands Inventory offers geospatial data and status and trend reports on wetlands across the US and its territories.

Satellite Imagery, Air Photos, and Derived Products

USGS Earth Resources Observation and Science Center (EROS) – http://glovis.usgs.gov/
Aerial photos, ASTER, EO-1, Landsat Archive, MODIS Terra and Aqua. A range of satellite imagery and satellite derived products.

USGS EarthExplorer – http://earthexplorer.usgs.gov/
Aerial photos, AVHRR, ASTER, EO-1, Landsat Archive, MODIS Terra and Aqua, Radar. A range of satellite imagery and satellite derived products, including some commercial and declassified satellites.

USGS NASA Land Processes Distributed Active Archive Center (LP DAAC) Data Pool – https://lpdaac.usgs.gov/get_data/data_pool/
ASTER, MODIS Terra and Aqua. Imagery and derived products.

OceanColorWeb – http://oceancolor.gsfc.nasa.gov/
MODIS Terra and Aqua, SeaWiFS, MERIS, CZCS, OCTS, VIRS. Imagery and ocean color products.

Species Occurrences

Global Biodiversity Information Facility – http://data.gbif.org/welcome.htm

OBIS SEAMAP – http://seamap.env.duke.edu/
Ocean Biogeographic Information System Spatial Ecological Analysis of Megavertebrate Populations

Center for Coastal Monitoring and Assessment – http://www.ccma.nos.noaa.gov/default.aspx

REEF Environmental Education Foundation – http://www.reef.org/

Species Databases:

AmphibiaWeb – http://amphibiaweb.org/

Avibase – http://avibase.bsc-eoc.org/

BirdLife International Data Zone – http://www.birdlife.org/datazone/home/

CaribHerp – http://php.scripts.psu.edu/dept/evobio/caribherp/index.php

Catalogue of Life – http://www.catalogueoflife.org/

FishBase – http://www.fishbase.org/

IUCN Red List of Threatened Species – http://www.iucnredlist.org/

Integrated Taxonomic Information System – http://www.itis.gov/

NatureServe – http://www.natureserve.org/

The Reptile Database – http://www.reptile-database.org/

World Register of Marine Species – http://www.marinespecies.org/

Publications, Articles, and Reports

Treesearch – http://www.treesearch.fs.fed.us/
Treesearch is an online depository and distribution center of publications by Research and Development scientists in the US Forest Service. You can download the full publications free of charge. The publications in the collection include research monographs published by the agency as well as papers written by our scientists but published by other organizations in their journals, conference proceedings, or books. Research results behind these publications have been peer reviewed to ensure the best quality science.