▁National ▁Register ▁of ▁Historic ▁Places ▁list ings ▁in ▁Mar l borough , ▁Massachusetts ▁ ▁References ▁ ▁Category : H istor ic ▁districts ▁in ▁M idd les ex ▁County , ▁Massachusetts ▁Category : Build ings ▁and ▁structures ▁in ▁Mar l borough , ▁Massachusetts ▁Category : National ▁Register ▁of ▁Historic ▁Places ▁in ▁M idd les ex ▁County , ▁Massachusetts ▁Category : H istor ic ▁districts ▁on ▁the ▁National ▁Register ▁of ▁Historic ▁Places ▁in ▁Massachusetts <0x0A> </s> ▁Sw imming ▁at ▁the ▁ 1 9 8 0 ▁Summer ▁Par al ym p ics ▁consisted ▁of ▁ 1 9 2 ▁events . ▁ ▁In ▁certain ▁events , ▁there ▁were ▁only ▁three ▁compet itors , ▁thus ▁guarantee ing ▁each ▁a ▁medal ▁upon ▁successfully ▁comple ting ▁the ▁race . ▁In ▁others , ▁there ▁were ▁fewer ▁than ▁three ; ▁in ▁the ▁women ' s ▁ 4 x 1 0 0 ▁met re ▁fre est yle ▁relay ▁C - D , ▁for ▁instance , ▁the ▁Canadian ▁team ▁sw am ▁uno pp osed , ▁obtain ing ▁gold ▁upon ▁comple ting ▁the ▁event . ▁The ▁women ' s ▁ 3 x 5 0 ▁met re ▁med ley ▁relay ▁CP ▁C ▁was ▁the ▁only ▁event ▁in ▁which ▁no ▁medal ▁was ▁awarded . ▁The ▁United ▁States ▁team ▁were ▁the ▁only ▁compet itors , ▁but ▁were ▁dis qual ified ▁during ▁the ▁race ; ▁thus , ▁no ▁team ▁completed ▁the ▁event . ▁ ▁Medal ▁table ▁ ▁Part icip ating ▁nations ▁ ▁Medal ▁summary ▁ ▁Men ' s ▁events ▁ ▁Women ' s ▁events ▁ ▁References ▁▁▁▁▁ ▁Category :