These 2 Chess Player monographs cover the strong tournaments in Mar del Plata 1971 and Pärnu 1971. The former had Browne, Najdorf, Mecking, Savon and Polugayevesky et al, and the latter, Tal, Keres, Leonid Stein, and Bronstein et al. My acquisition costs were $4.95 and $4.75 respectively. The former had a detailed opening survey the latter just the game scores. The former is in English descriptive notation, the latter in algebraic notation. The latter is in small format as shown in the photographs.