Scope and Contents This expedition, the first official one of the Academy, included J. E. Ives, Roberts LeBoutillier, Witmer Stone and Frank C. Baker in the party. Arriving on the 22nd of February, they covered the territory of the northwestern part of Yucatan and the Mexican highlands in the vicinity of Orizaba. Natural history specimens were gathered and photographic records of the ecological conditions and the contours of the country through which they travelled, were taken. The short time spent in the...

Scope and Contents From the Collection:

The Mabelle Campbell photograph collection includes six photo albums, thirty-nine loose photos, two Philadelphia Rapid Transit Company Hiking Club Lists, and nine pamphlets from the Leidy Microscopical Club. The albums, photos, and papers document excursions of the Delaware Valley Naturalists Union from 1894-1939. According to a conversation with Mrs. Campbell in 1980, most of the photographs were taken by Harold Palmer

This collection is arranged chronologically.

Scope and Contents From the Collection:

The Mabelle Campbell photograph collection includes six photo albums, thirty-nine loose photos, two Philadelphia Rapid Transit Company Hiking Club Lists, and nine pamphlets from the Leidy Microscopical Club. The albums, photos, and papers document excursions of the Delaware Valley Naturalists Union from 1894-1939. According to a conversation with Mrs. Campbell in 1980, most of the photographs were taken by Harold Palmer

This collection is arranged chronologically.

Scope and Contents From the Collection:

The Mabelle Campbell photograph collection includes six photo albums, thirty-nine loose photos, two Philadelphia Rapid Transit Company Hiking Club Lists, and nine pamphlets from the Leidy Microscopical Club. The albums, photos, and papers document excursions of the Delaware Valley Naturalists Union from 1894-1939. According to a conversation with Mrs. Campbell in 1980, most of the photographs were taken by Harold Palmer

This collection is arranged chronologically.

Scope and Contents

Lochman. a doctor in Bethlehem, Pennsylvania, created this album of 220 cyanotypes of live plants, indigenous and introduced, growing without protection in the United States. Album has a manuscript title-page, Preface, index and captions.

Given to the Academy by Lochman on Dec. 21, 1896.

Collection contains materials related to botany, photography, printing, advertising, and patent law.

Scope and Contents From the Collection:

The Mabelle Campbell photograph collection includes six photo albums, thirty-nine loose photos, two Philadelphia Rapid Transit Company Hiking Club Lists, and nine pamphlets from the Leidy Microscopical Club. The albums, photos, and papers document excursions of the Delaware Valley Naturalists Union from 1894-1939. According to a conversation with Mrs. Campbell in 1980, most of the photographs were taken by Harold Palmer

This collection is arranged chronologically.

Scope and Contents From the Collection:

The Mabelle Campbell photograph collection includes six photo albums, thirty-nine loose photos, two Philadelphia Rapid Transit Company Hiking Club Lists, and nine pamphlets from the Leidy Microscopical Club. The albums, photos, and papers document excursions of the Delaware Valley Naturalists Union from 1894-1939. According to a conversation with Mrs. Campbell in 1980, most of the photographs were taken by Harold Palmer

This collection is arranged chronologically.

Overview Crawford Hallock Greenewalt (1902-1993) was a chemical engineer and the President of the DuPont Company from 1948 to 1962. He had a passion for the natural sciences, and combined his love of ornithology with photography. He was especially known for his high speed photographs of hummingbirds. His ornithological interests included bird songs, the radiance of hummingbird feathers and the evolution of shapes and sizes of birds in relation to their flight abilities. The Crawford H. Greenewalt...

Scope and Contents From the Collection:

The Mabelle Campbell photograph collection includes six photo albums, thirty-nine loose photos, two Philadelphia Rapid Transit Company Hiking Club Lists, and nine pamphlets from the Leidy Microscopical Club. The albums, photos, and papers document excursions of the Delaware Valley Naturalists Union from 1894-1939. According to a conversation with Mrs. Campbell in 1980, most of the photographs were taken by Harold Palmer

This collection is arranged chronologically.