There is this about letters
Subtitle: a collection of lectures delivered before the Six O'clock Club. "6O'"
Contributors: Gerding, Herbert Lewis
Edition: "First edition.".
Publisher: Gerding Pub. Co.
Published: 1931
Place of publication: St. Louis
Language: eng
Number of pages: 272
Copyright date: 1931
Subjects: Commercial correspondence; Advertising
Notes: H.L. Gerding, secretary of the club. cf. p. [v]

The series note, "The Six O'clock lectures" appears on half-title preceding each lecture.

Microfilm. New York, N.Y., Columbia University Libraries, 1994. 1 microfilm reel, 35 mm.

Filmed; NEH Project (FMEST); 1994.