This image was acquired from
wikimedia. It was marked as Public Domain or CC0 and is free to use. To verify, go to the source and check the information there.
NSRWAeronauticsspherical balloon. Cropped image only version of Image LANSRW from The New Student's Reference Work Another version of the same image is available Image NSRW Spherical Balloon Image LANSRW Gas balloons Balloon aircraft in art Shapes resembling number
Page 2023 Free-images.com. All images are Public Domain