Inland Marine Frequencies 
 ca. 1964

Frequency  Channel     Uses and limitations
KHz.

2182               9            International safety & calling

2782               5            Traffic( shared by all  Inland stations)

4072.4            1            Traffic ( Shared by WJG Memphis and WGK St. Louis)

4377.4            7            Traffic ( Shared by WCM Pittsburgh and WFN Louisville)

6240               8            Traffic ( Used mostly by WCM and WFN)

8210.8            6            Traffic ( Used mostly by WCM WFN and WGK)

If there were frequencies assigned above 8 MHz. they were seldom used at this time.

I (WCM’s Frank Deedrick) don’t know who numbered the channels, but yes it is correct, 6 MHz. was channel 8 and 8 MHz. was channel 6.  Most of the time channel sharing was quite cooperative, but occasionally situations came up that caused problems but these were rare and were usually amicably resolved.