File:Lippisch Delta 1 3-view NACA aircraft Circular No.159.jpg

Size of this preview: 626 × 600 pixels. Other resolutions: 250 × 240 pixels | 501 × 480 pixels | 801 × 768 pixels | 1,069 × 1,024 pixels | 1,725 × 1,653 pixels.

Original file ‎(1,725 × 1,653 pixels, file size: 162 KB, MIME type: image/jpeg)

This is a file from the Wikimedia Commons. Information from its description page there is shown below.
Commons is a freely licensed media file repository. You can help.

Summary

Description	English: Lippisch Delta 1 3-view drawing from NACA aircraft Circular No.159
Date	1 March 1932
Source	https://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/19930090268.pdf
Author	NACA Aircraft Circular

Licensing

	This file is in the public domain in the United States because it was solely created by NASA. NASA copyright policy states that "NASA material is not protected by copyright unless noted". (See Template:PD-USGov, NASA copyright policy page or JPL Image Use Policy.)
	Warnings: Use of NASA logos, insignia and emblems is restricted per U.S. law 14 CFR 1221. The NASA website hosts a large number of images from the Soviet/Russian space agency, and other non-American space agencies. These are not necessarily in the public domain. Materials based on Hubble Space Telescope data may be copyrighted if they are not explicitly produced by the STScI.[1] See also {{PD-Hubble}} and {{Cc-Hubble}}. The SOHO (ESA & NASA) joint project implies that all materials created by its probe are copyrighted and require permission for commercial non-educational use. [2] Images featured on the Astronomy Picture of the Day (APOD) web site may be copyrighted. [3] The National Space Science Data Center (NSSDC) site has been known to host copyrighted content. Its photo gallery FAQ states that all of the images in the photo gallery are in the public domain "Unless otherwise noted."