Van de Boogaard, Hollow Square, 1968

Note: This reel-to-reel tape was labeled "Van de Boogaard, Hollow Square, 1968." Upon digitization, it was found that the tape actually contains two audio recordings: 1) Hollow Square talk: "Weatherman 'Bogaard's' Course in Do-It-Yourself Weather Forecasting, Part II: From Amateur to Professional," Henry van de Boogaard, February 9, 1968; 2) Hollow Square talk: "Fiber Optics: An Alternative to Scattering and Extinction for Particle Size Determination," Robert (Bob) Knollenberg, September 6, 1968. Digitized versions of the recordings are available in the OpenSky digital repository.