All pretty common knowledge for us oldfags but interesting all the same.
https://impiousdigest.com/wp-content/uploads/2018/03/eagle-ii.pdf?fbclid=IwAR3kKQf7ehxqaVJ0aiGLeslu2LsMTkoXC3L0J8kx9d0I6fuYzkseRaiAJNs
It’s real, I just posted the same exact link above