IIRC there was also a National application/tutorial on heat sinks and thermal resistance, junction to case, junction to ambient, etc. That was good for covering the basics.
Yes, there was...
"Heatsinking," National Semiconductor Audio Handbook, pg. 4-46 to 4-50, 1976.
https://www.ka-electronics.com/images/p ... inking.pdf
"Heatsinking," National Semiconductor Audio Handbook, pg. 4-46 to 4-50, 1976.