silman's complete endgame course
Best Endgame Book

Dvoretsky's Endgame Manual is an ultimate one-volume manual on the endgame. It is a masterpiece of research and insight staggering in it's depth and accuracy.
I don't know that I think it is a particularly good idea to seek a book "that covers every aspect of the endgame", but if that is what one wants, I suppose the two main candidates are Dvoretsky's Endgame Manual by Mark Dvoretsky
https://web.archive.org/web/20140708233815/http://www.chesscafe.com/text/review399.pdf
and Fundamental Chess Endings by Müller and Lamprecht.
What is the best endgame book on the market? I am looking to by one that covers almost every aspect of the endgame. I am rated 1645 USCF. Please leave your recommendations in the comments below!