Set of 7 Reference Line Maps, Charts and DSS Images for M67. This series of maps has been developed for use with the Reference Line Method. It adapts well to both binoculars and telescopes.
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A set of 7 DSS images, charts and Reference Line Maps of M44 (Praesepe, Beehive Cluster). This series of maps has been developed for use with the Reference Line Method. It adapts well to both binoculars and …