This collection primarily consists of Helliwell's lab notebooks, journal articles, and technical reports.

Helliwell graduated from Stanford with his bachelor's, master's and doctoral degrees. In 1946, he joined the faculty in Stanford's Department of Electrical Engineering. Helliwell's research on whistlers led to many prominent journal articles and technical reports on the subject. He passed away in 2011.

4 Linear Feet (2 cartons & 2 boxes)

All requests to reproduce, publish, quote from, or otherwise use collection materials must be submitted in writing to the Head of Special Collections and University Archives, Stanford University Libraries, Stanford, California 94304-6064. Consent is given on behalf of Special Collections as the owner of the physical items and is not intended to include or imply permission from the copyright owner. Such permission must be obtained from the copyright owner, heir(s) or assigns. Restrictions also apply to digital representations of the original materials. Use of digital files is restricted to research and educational purposes.

The materials are open for research use. Audio-visual materials are not available in original format, and must be reformatted to a digital use copy.