FURTHER OPTICAL OBSERVATIONS OF HZ HERCULIS by BAHCALL, JOHN N., BAHCALL, NETA A., HERCZEG, TIBOR J., JOSS, PAUL C., LEIBOWITZ, ELIA M., SEGALOVITZ, ALEX, STOLERO, SHMUEL, VERON, M., VÉRON, M., VÉRON, P., WEHINGER, PETER A., WEISTROP, DONNA, WYCKOFF, SUSAN

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