Make Philatelic Friends and Offer Chinese Stamps

  I am from PR China,like to colletc stamps and philatelic items
worldwide.I want to make philatelic friends all world.
  My Topical is geology,mineral,gem,rock formation,volcano,
waterfall and mountain.I need stamps and it`s items above topical,
especially want FDCs,entire covers,proofs,errors,variety and 
postmarks on geology,mineral and rock formation.I can offer Chinese 
stamps or it`s items for exchange with you,also buy it.Welcome,send
me a list with price.
  I can supply PR China stamps(1949-1997),include FDCs,MCs,Postmarks 
and entire covers.I offer RO China entire covers(1912-1949),too.
Please tell me a list which you need.

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Zhang Qingzhong
146 Wuqing Road
Changzhou, Jiangsu 213003
People's Rep. of China