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We present observations of massive star-forming regions selected from theIRAS Point Source Catalog. The observations were made with the Very Large Arrayand the Large Millimeter Telescope to search for Class I methanol masers. Wemade interferometric observations of 125 massive star-forming regions in the 44GHz methanol maser transition; 53 of the 125 fields showed emission. The dataallow us to demonstrate associations, at arcsecond precision, of the Class Imaser emission with outflows, HII regions and shocks traced by 4.5 $\mu$memission. We made single-dish observations toward 38 of 53 regions with 44 GHzmasers detected to search for methanol transitions at 84.5, 95.1, 96.7, 107.0,and 108.8 GHz. We find detection rates of 74, 55, 100, 3, and 45%,respectively. We used a wide-band receiver which revealed many other spectrallines that are common in star-forming regions.

Interferometric and single-dish observations of 44, 84 and 95 GHz Class I methanol masers