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Telephone numbers for the Marshall Space Flight Center (MSFC) of the National Aeronautics and Space Administration in Huntsville, Ala. and for the Air Force Geophysics Laboratory (AFGL) at Hanscomb Air Force Base, Mass., have recently been changed.

The exchange at MSFC has changed from 453 to 544. For most extensions, the last four digits have also changed. The main switchboard can be reached by dialing 205-544-2121.