TY - RPRT T1 - Reconstruction of Past Climatic Variability (A Progress Report) 1 January through 30 June 1974 Y1 - 1974 A1 - Fritts, H. KW - ARPA KW - climatic variability KW - dendroclimatology KW - past climate KW - reconstruction KW - tree rings PB - Laboratory of Tree-Ring Research CY - Tucson IS - 1 January through 30 June 1974 ER - TY - RPRT T1 - Reconstruction of Past Climatic Variability (A Progress Report) 30 June through 31 December 1974 Y1 - 1974 A1 - Fritts, H. KW - ARPA KW - climatic variability KW - dendroclimatology KW - past climate KW - reconstruction KW - tree rings PB - Laboratory of Tree-Ring Research CY - Tucson IS - 30 June through 31 December 1974 ER -