The short version The archive turns up 18 records, most of them around Andean colonial city, possibly Ecuador and Andean South America (possibly Arequipa, Peru). 15 are confidently dated; the other 3 are educated guesses — about as precise as it sounds. All are free to use.
Posing at the International Building, Rockefeller Center, New York, 1960s
1960–1969 · Rockefeller Center, New York City
Textilträger und neugierige Menschenmenge, Andenstraße, 1960er Jahre
1960–1969 · Andean South America (possibly Arequipa, Peru)
Chaac-Maskenfassade, Codz-Poop-Palast, Kabah, Yucatan, 1960er Jahre
1960–1969 · Kabah, Yucatan, Mexico
Highland Market Bargaining, Guatemala, 1960s
1960–1969 · Guatemalan Highlands
Klosterhof durch einen kolonialen Torbogen, Anden, 1960er Jahre
1960–1969 · Andean colonial city, possibly Ecuador
Kaiser Wilhelm Memorial Church and New Tower, West Berlin, 1960s
1960–1969 · Berlin, Germany
Trapezoidal Doorway Framing the Ruins, Machu Picchu, 1960s
1960–1969 · Machu Picchu, Peru
Working Dog on a Chain, Nordic Summer Camp, 1960s
1960–1969
The Freedom Bell Plaque, Rathaus Schöneberg, West Berlin, 1960s
1960–1969 · Rathaus Schöneberg, Berlin
Köder am Haken, Boot am See, 1960er Jahre
1960–1969
Holländische Kokermühle auf ihrem Umgang, Niederlande, 1960er Jahre
1960–1969 · Netherlands
Meilenstein 1523, Endpunktschild des Alaska Highway, Fairbanks, 1960er Jahre
1960–1969 · Fairbanks, Alaska
Bronze Age Gold Discs and Spearheads in a Museum Case, 1960s
1960–1969
Tourist an einer Balkanruine, 1960er Jahre
1960–1969 · Balkan region
Plattfisch auf Sand, 1960er Jahre
1960–1969
Cenote or Spring-Fed Pool, Yucatan, 1960s
1960–1969
Cenote or Subtropical Spring, Aerial View, circa 1960s-1970s
1960–1975
Forested River Valley with Pasture, Appalachian Region, 1970s
1968–1978
certain
inferred
low confidence