"woodstock" is close to Expressa EF Heavy by Elsner&Flake

Expressa works if the poster actually post-dates 1974 (when E&F designed the typeface; not sure I trust the copyright). Otherwise, woodstock is more likely ITC Bauhaus Heavy, with some customization:
http://www.myfonts.com/fonts/adobe/itc-bauhaus/

Burko is a likely candidate as it was released before 1970.

I think Burko is the best candidate so far ;)

Thanks for the history lesson, Stephen.

If I had been paying attention, I'd have noticed that ITC Bauhaus didn't come on the scene until 1975. Its precursor—Herbert Bayer's Universal—had been around since the 1920s, though.

Burko looks good for both weights.

Visual Graphics Corp VGC had a phototype font called Bubble that could also have been a source.