This collection consists of a correspondence including:

Letters and notes to and from Neal with Heinrich Leonhards Skuja (1892–1972), Frances Grace Smith (1871–1948), C.E. Snow (?), P.E. Spalding (?), Harold St. John (1892–1991), and Leonard D. Tuthill (1911–1988).

An undated handwritten note from an unknown correspondent, Vlad (?).

A handwritten letter dated June 17, 1957 from a correspondent known only as "Mary."

An undated handwritten letter to "E.H.B."

A typed letter dated September 30, 1968 from a correspondent known only as "Bryan."

Other materials include:

A sketchbook and varia of hand drawings of plants, dated to 1967.

An undated, illustrated flyer titled "Symbolism of Herbs."

A business card for Prof. Dr. Misao Tatewaki (1899–1976), Director of the Botanic Garden at Hokkaido University in Sapporo, Japan.

A clipping of an obituary dated July 10, 1957 from an unknown newspaper on the death of Dr. Harold L. Lyon (1879–1957).