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Fig. 1. 



Fig. 2. 



Fig. 1 — Tropical vegetation, clearing on the river bank and rubber station at 

 Pongo de Mainique. The pronounced scarp on the northeastern border of the Andes 

 is seen in the right background. 



Fig. 2 — Pushing a heavy dugout against the current in the rapids below Pongo de 

 Mainique. The Indian boy and his father in the canoe had been accidentally shot. 



