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46661. Circular. N. Manual of surface observations, 6th edition, revised, Changes 3; July 1952.

Corporate/Agency Authors:: Weather Bureau and Commerce Dept.
Publisher:: Weather Bureau
SuDoc number:: C 30.4:N/951/ch.3

46662. Circulars. Manual of surface observations, 6th edition, revised. Weather Bureau addendum; Nov. 1951.

Corporate/Agency Authors:: Weather Bureau and Commerce Dept.
Publisher:: Weather Bureau
SuDoc number:: C 30.4:N/951/add.

46663. Circulars. N. Manual of surface observations. 6th edition, revised. Changes 1 and 2; Nov. 1, 1951 and Jan. 1, 1952.

Corporate/Agency Authors:: Weather Bureau and Commerce Dept.
Publisher:: Weather Bureau
SuDoc number:: C 30.4:N/951/ch.1-2

46664. Civil aeronautics manual 42 [Irregular air carrier certification and operation rules], supp. 2; June 15, 1950.

Corporate/Agency Authors:: Civil Aeronautics Administration and Commerce Dept.
Publisher:: Civil Aeronautics Administration
SuDoc number:: C 31.107:42/2/supp.2

46665. Civil aeronautics manual. 18. [Maintenance, repair, and alteration of certified aircraft, engines, propellers, and instruments], supp. 1; Apr. 16, 1951.

Corporate/Agency Authors:: Civil Aeronautics Administration and Commerce Dept.
Publisher:: Civil Aeronautics Administration
SuDoc number:: C 31.107:18/3/supp.1

46666. Civil aeronautics manual. 50. Airman agency certificates, ground and flying school ratings [with list of reference material]; Aug. 1951.

Corporate/Agency Authors:: Civil Aeronautics Administration and Commerce Dept.
Publisher:: Civil Aeronautics Administration
SuDoc number:: C 31.107:50/4

46667. Classification of patents issued Dec. 6, 1949-May 30, 1950.

Corporate/Agency Authors:: Patent Office and Commerce Dept.
Publisher:: Patent Office
SuDoc number:: C 21.5/a 1:629/1-634/5

46668. Classification of patents issued June 6-Dec. 20, 1950.

Corporate/Agency Authors:: Patent Office and Commerce Dept.
Publisher:: Patent Office
SuDoc number:: C 21.5/a 1:635/1-041/4

46669. Classification of patents.

Corporate/Agency Authors:: Patent Office and Commerce Dept.
Publisher:: Patent Office
SuDoc number:: C 21.5/a 1:660/1-665/5

46670. Classification of patents.

Corporate/Agency Authors:: Patent Office and Commerce Dept.
Publisher:: Patent Office
SuDoc number:: C 21.5/a 1:647/1-653/4

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