Bibliography Details

“John Robert Schwenk.” FindAGrave.com, n.d. https://www.findagrave.com/memorial/167183259/john-robert-schwenk.

The following is a complete listing of all citations using this source:

§ 2.1. Characteristics of Early Questar Telescopes

• Citation No. 1

Chapter 4. The Steady Years

• Citation No. 2