Description

"At about 16:30 in the afternoon of 19 July 1952, the attention of Customs Inspector, Sr. Domingo Troncoso, then with the Peruvian Customs Office at Puetro Maldonado on the jungle frontier of Bolivia, was called to a very strange cigar-shaped flying object over the river area. The big dirigible-shaped craft was flying horizontally and fairly low in the sky, passing from right to left from the observers position. It was leaving a dense
trail of thick smoke, vapor, or substance of same kind
on its wake. The thick whitish substance appeared to be
emitted from the aft end of the object in flight. That
this object was a real, structured, physical machine may
be seen from its reflection in the waters of the Madre
de Dios river underneath it. It can be clearly seen to
be well above the broad-leaved jungle trees along the
bank of the river in the foreground of the picture. The
object was estimated to be over a hundred feet long.
Sr. Troncoso obtained a camera and was able to get one
good photograph of the cigar-shaped object."

Taken from UFO PHOTOGRAPHS Vol. 2, published sometime in the 1980s.