Rogoff-Spencer, annotated by Fischer
Kenneth Rogoff is a retired American grandmaster now best known as an economist, but there are some interesting materials on his website (see this page) looking back at his chess career. One such article, from the October 1969 Boys Life, looks at his win over Steve Spencer from that year's U.S. Junior Championship (won by Rogoff). The article is by none other than Bobby Fischer, and thus especially worth a look.