Vintage illustration of equilateral triangle digitally enhanced from our own vintage edition of The Fruit Grower's Guide… https://www.rawpixel.com/image/50869/free-illustration-image-triangle-vintage-1800sFree Image from public domain licenseThe fruit grower's guide : Vintage illustration of equilateral triangle https://www.rawpixel.com/image/50884/premium-illustration-psd-botanic-cultivation-designView license