RELATIONSHIPS OF LEAD AND ZINC CONTENTS OF TREES AND SOILS, UPPER MISSISSIPPI VALLEY DISTRICT.KEITH JR.1969; TRANS. SOC. MING ENGRS AIME; USA; 1969(9), VOL. 244, NUM. 0003, P. 353 A 355Miscellaneous

ELEMENT DISTRIBUTION IN SOME TROUGH AND PLATFORM TYPES OF BLACK SHALE AND ASSOCIATED ROCKS.VINE JD; TOURTELOT EB; KEITH JR et al.1969; GEOL. SURV. U.S.A., BULL.; USA; 1969, NUM. 1214Miscellaneous

ELEMENTAL COMPOSITION OF SELECTED NATIVE PLANTS AND ASSOCIATED SOILS FROM MAJOR VEGETATION-TYPE AREAS IN MISSOURI.ERDMAN JA; SHACKLETTE HT; KEITH JR et al.1976; GEOL. SURV. U.S.A., PROF. PAPER; U.S.A.; DA. 1976; NO 954C; PP. 1-87; BIBL. 1 P.; 86 ILL.; 1000 ANAL.Serial Issue