https://en.wikipedia.org/wiki/Category:1970s_Polish_agricultural_aircraft
Category:1970s Polish agricultural aircraft - Wikipedia
agricultural aircraftcategory1970spolishwikipedia
https://www.faa.gov/forms/index.cfm/go/document.information/documentID/1020386
Form FAA 8710-3 - Agricultural Aircraft Operator Certification Application
The Federal Aviation Administration is an operating mode of the U.S. Department of Transportation.
agricultural aircraftoperator certificationformfaa8710