Lippisch Delta 1 3-view drawing from NACA aircraft Circular No.159
NACA Aircraft Circular
<a rel="nofollow" class="external free" href="https://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/19930090268.pdf">https://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/19930090268.pdf</a>