▁His ▁research , ▁in ▁collaboration ▁with ▁T . ▁Gro en ew ald ▁was ▁published ▁in ▁the ▁journ als ▁Gold ▁Bul letin ▁and ▁Gold ▁Technology . ▁In ▁ 1 9 7 8 ▁Rap son ▁and ▁Gro en ew ald ▁co - author ed ▁the ▁book ▁Gold ▁Us age , ▁the ▁first ▁text book ▁on ▁gold ▁to ▁be ▁published ▁since ▁Die ▁Ed el met alle ▁und ▁I hre ▁Leg ier ungen ▁by ▁E . ▁Ra ub ▁( 1 9 4 0 ). ▁Rap son ▁later ▁went ▁on ▁to ▁translate ▁Die ▁Ed el met alle ▁und ▁I hre ▁Leg ier ungen ▁into ▁English ▁but ▁that ▁version ▁was ▁only ▁published ▁after ▁his ▁death . ▁ ▁Private ▁life ▁ ▁In ▁ 1 9 3 7 ▁Rap son ▁married ▁Joy ce ▁Rach el ▁A bey , ▁who ▁had ▁been ▁perman ently ▁disabled ▁in ▁a ▁motor cycle ▁accident ▁prior ▁to ▁them ▁meeting . ▁They ▁had ▁two ▁daughters . ▁She ▁died ▁in ▁ 1 9 9 6 . ▁Rap son ▁died ▁in ▁ 1 9 9 9 . ▁ ▁Selected ▁works ▁▁ ▁Rap son , ▁W . ▁S . ▁and ▁Gro en ew ald , ▁T . ▁ ▁( 1 9 7 8 ) ▁Gold ▁Us age . ▁Academ ic ▁Press . ▁. ▁ ▁Source ▁ ▁Austin , ▁Brian ▁( 2 0 0 1 ) ▁Sch on land ▁– ▁Scient ist ▁and ▁Sold ier , ▁I OP P , ▁Br istol , ▁ ▁References ▁▁ ▁Category : 1 9 1 2 ▁birth s ▁Category : 1 9 9 9 ▁death s