Porto, Guido G. Informal export barriers and poverty / Guido G. Porto - Washington, D.C. : The World Bank (WB) , 2004 - 38p. : ill. ; 25 cm. - Policy research working paper No. 3354 . Subjects--Topical Terms: TradePovertyInternational trade Gov. Doc. Class. No.: UN WB PRWP-3354