The proper motions of 1418 stars in and near the clusters h and chi Persei / door Adriaan van MaanenDe bepaling van de afstanden der sterren / A. van MaanenThe proper motions of 1418 stars in and near the clusters h and chi Persei / Adriaan van MaanenThe proper motions of 1418 stars in and near the clusters h and chi Persei / door Adriaan van Maanen