The following is a list of resources for Urban Agriculture

• http://pubs.cas.psu.edu/Publications.asp - Penn State College of Ag Science Publications- A wealth of knowledge in form of many publications, manuals and factsheets. A quick search has access to an abundant number of topics. Many of these are accessible in PDF format for viewing. These publications can also be odered. To oder, contact your local extension office: philadelphia.extension.psu.edu/
• www.pennsylvaniahorticulturalsociety.org -  The PHS offers a wide variety of publications for people interested in gardening and urban greening. 
• philadelphia.extension.psu.edu/ - Philadelphia Outreach Center, Penn State Extension
• www.agriculture.state.pa.us/ - Pennsylvania Department of Agriculture
• www.phila.gov/water/ - Philadelphia Water Department
• www.philadelphiasustainabilityawards.org/awards - Philadelphia Sustainability Awards
• www.pecpa.org - Pennsylvania Environmental Council
• www.cityparksphila.org - City Parks Association-
• http://cas.psu.edu -
• www.pasafarming.org
• www.smallfarmingsuccess.info
• www.localfoodphilly.org
• http://www.rodaleinstitute.org/home
• http://pubs.cas.psu.edu/freepubs/pdfs/uc187.pdf An article on weed management in organic crops

Examples of Urban Agriculture in other areas

• www.cityfarmer.org - Based in Vancouver, BC, Canada, City Farmer is Canada's office of Urban Agriculture
• http://www.urbanhabitatchicago.org/projects/true-nature-foods/ - Rooftop agriculture in Chicago
• http://www.dug.org/home.html - Denver Urban Gardens- operates and assists with the creation and management of over 60 metro-area community gardens and small parks.