Clay Township was enumerated on 21-23 October 1850 by J. H. Robinson, Asst. Marshall. Microfilm is Series M432, Roll 185, Pages 216B-221B. People were to be listed according to "their usual place of abode on the first day of June 1850."
In this transcription by Richard Harrison the dwelling number and family number columns have been consolidated as the enumerator didn't differentiate. Other unused columns have been eliminated.
The "M" column
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"Married within the year."
The "S" column
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"Attended school within the year."
The "L" column
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"Persons over 20 years of age who cannot "read or write."