1 9 6 4 ▁as ▁a ▁mem orial ▁to ▁the ▁UN ▁Secretary ▁General ▁D ag ▁Ham mar sk jö ld ▁after ▁his ▁death ▁in ▁an ▁air ▁crash ▁in ▁Africa ▁in ▁ 1 9 6 1 . ▁ ▁Conserv ation ▁and ▁maintenance ▁The ▁main ▁entity ▁responsible ▁for ▁the ▁conservation ▁of ▁the ▁collection ▁is ▁the ▁UN ▁Arts ▁Committee . ▁The ▁United ▁Nations ▁is ▁assist ed , ▁through ▁a ▁special ▁mand ate ▁and ▁reg ulations , ▁by ▁fund ra ising ▁groups ▁such ▁as ▁the ▁Ma ec enas ▁World ▁Pat rim ony ▁Foundation ▁in ▁this ▁ende avor ▁of ▁pres erving ▁these ▁art istic ▁and ▁international ▁her it ages . ▁However , ▁about ▁ 5 0 ▁g ifts , ▁partly ▁close ▁to ▁dissol ution , ▁are ▁stored ▁in ▁the ▁bas ement ; ▁and ▁in ▁some ▁cases , ▁have ▁been ▁so ▁for ▁dec ades . ▁ ▁See ▁also ▁▁ ▁Cel est ial ▁S phere ▁Wood row ▁Wilson ▁Memorial ▁ ▁References ▁ ▁External ▁links ▁ ▁Category : Year ▁of ▁establishment ▁missing ▁Category : Art ▁museum ▁collections ▁Category : Head quarters ▁of ▁the ▁United ▁Nations ▁Category : M useum s ▁in ▁Manh attan ▁Category : Art ▁museum s ▁in ▁New ▁York ▁City ▁Category : Collections ▁of ▁museum s ▁in ▁the ▁United ▁States ▁Category : Di plom atic ▁g ifts ▁Category : Un ited ▁Nations ▁art ▁collection <0x0A> </s> ▁Marcus ▁Allen ▁C ool idge ▁( Oct ober ▁ 6 , ▁ 1 8 6 5 J anu ary ▁ 2 3 , ▁ 1 9 4 7 ) ▁was ▁a ▁Democratic ▁United