| pen Cluster | |
| Ref: | =1951SoByu...9....1M |
| by | MARKARIAN B.E. |
| Soobshch. Byurakan Obs., 9, 1-40 (1951) | |
| On the classification of open (galactic) stellar clusters. II. Preliminary list of open O-type star clusters. | |
| o | Table 1: <Cl Mrk NN> (Nos 1-50) |
====Sorry, no entry could be found==== | |