You may want to contact the Camden office of the Rutgers Agricultural Extension as a way to tap into the institutional memories of their extension agents and master gardeners
Rutgers/Camden Ext Office
This link to the City of Camden's website should help you contact the folks in the Parks & City Planning Depts who might be able to get you some leads. Also, the site has currently posted RFPs - one is for soil testing. You might, if you play it right, be able to piggy-back your soil testing onto that if you know your local politicians.
Clinton Community Garden
Subj: [cg] (no subject)
Date: 8/28/03 9:13:36 PM Eastern Daylight Time
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i just started subscribing to the list and i am interesting in reading what i missed about gardening in camden. i just moved to camden and am currently involved in starting up some gardens and would love to hear if anyone knows any history to share. thanks