National Geographic photographs: the milestones

Introduction : foundations / Leah Bendavid-Val

1888-1930 : novelty and possibility / Robert A. Sobieszek

The special collections

gems in the gold mine

1931-1950 : depression, war, and color / Carole Naggar

"Natural color"

breakthroughs with color film

1951-1970 : cliche and change / Anne H. Hoy

Probing the depths

photography dives beneath the seas

1971-1990 : realism and individuality / Ferdinand Protzman

Photographers with an edge

the personal viewpoint

1991-1999 : imaginative continuity / Fred Ritchin

Shots from two miles down to ten miles up

new technologies.