00398nam a2200157Ia 4500008004100000041001200041082000600053082001100059100002500070100001300095245010200108260000600210260000900216260000900225650000600234150909s9999    xx            000 0 und d  aEnglish  a-  bPEN/IN  aPennylvania State     eCompiler  aInvestment and capacity fluctuations in the phosphate rock and phosphatic fertilizer industries *  a-  bNTIS  c1977  a_