Donny's Vintage Baseball Cards

Online Card Trading Groups
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Trading Bases

Vintage Card Traders (VCT)

Dugout Traders

Online Card Trading Forums
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Trading Card Central

Net54 Vintage Baseball Card Forums and Buy/Sell/Trade Board

The Bench Trading

Collector's Universe Forums

Other Helpful Card Collecting Links
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Mark Wing's Condition Guide

The Tobacco Card Company

T206 Museum 

The National Sports Collectors Convention - Chicago, IL