17 lO T T T Sples . | gp 25 |O | cel 37 Zn6S / C960 C&O 2 2 10-F 7 = y Oo. £ Cc > 3 oO = le _ w =< GUANO 1d _t J 0.5 LO l | 5 MEV Fig. 8. Gamma-ray spectra of litter and guano collected in an area of old soil.

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