Home › Authors › Humboldt County (Calif.). Board of Supervisors 👤 Humboldt County (Calif.). Board of Supervisors 2 books Books by Humboldt County (Calif.). Board of Supervisors $2,540,882.30 improvement bonds, McKinleyville assessment district no. 1 issued under the Improvement Bond Act of 1915 and $31,957.40 certificate representing assessments against public property in McKinleyville assessment district no. 1 1976 Master plan of airports Master plan of airports 1947