Couldn't bear to see those unfortunate Fiche scans for Silver Streak 20 any longer, so I've bitten the bullet and scanned both 20 & 21 from my own collection, both high grade books, all paper, though in the interests of keeping these files from being colossal I do cop to editorializing by virtue of those features which are at slightly lower rez than others.
The intro of Wolverton's Scoop Scuttle, prime early Everett art on the Red Reed intro, Dick Briefer Pirate Prince, Bob Montana art, other more mediocre entries, all fascinating.
Enjoy.