On the Subject Heading and Term source codes page, LC says:

“These sources are general subject heading and thesauri, such as the Library of Congress Subject Headings, along with a number of focused subject term lists like Medical Subject Headings or Getty Thesaurus of Geographic Names. Additional specialized lists are provided with source codes in

• Genre/Form Term and Code Source Codes
• Occupation Term Source Codes
• Function Term Source Codes

Since general thesauri often contain a broad spectrum of terms, including genre, forms, occupations, and functions, the source codes in this list may be used in the metadata elements identified for each of the specialized source lists. Likewise, the special thesauri listed there may also be used in the metadata elements identified below under usage.

Some subject heading lists incorporate names and titles and others employ independent name and title lists for parts of a subject heading. Thus the lists assigned source codes in Name and Title Source Codes may also be used in the metadata elements identified below under usage”

This seems to mean that all of the source codes in all of the lists mentioned above can, for validation purposes, be joined together into a single list, and that the source codes in this expanded list will then be valid in any MARC element listed in the 'Usage' section of any of the lists mentioned above.

Bibliographic records

033 $2 (Date/Time and Place of an Event / Source)
257 $2 (Country of Producing Entity / Source)
380 $2 (Form of Work / Source)
381 $2 (Other Distinguishing Characteristics of Work or Expression / Source)
518 $2 (Date/Time and Place of Event Note / Source)
600-651 $2 (Subject Added Entry / Source)
654 $2 (Subject Added Entry -- Faceted Topical Term / Source) 
662 $2 (Subject Added Entry – Hierarchical place name / Source) 
751 $2 (Added Entry – Geographical Name / Source) 
752 $2 (Added Entry – Hierarchical Place Name / Source) 

Authority records

040 $f (Cataloging Source / Subject heading / thesaurus conventions
700-788 $2 (Heading Linking Entries / Source)
370 $2 (Associated Place / Source of term)
372 $2 (Field of Activity / Source of term)
373 $2 (Affiliation / Source of term)
376 $2 (Family Information / Source of term)
380 $2 (Form of Work / Source of term)
381 $2 (Other Distinguishing Characteristics of Work or Expression / Source)

Community Information records

600-651 $2 (Subject Added Entry / Source of heading or term)
654 $2 (Subject Added Entry -- Faceted Topical Term / Source) 

Bibliographic records

655 $2 (Index Term – Genre/Form / Source of term)
336 $2 (Content Type / Source)
337 $2 (Media Type / Source)
338 $2 (Carrier Type / Source)

Authority records

755 $2 (Established Heading Linking Entry – Genre/Form Term / Source)
336 $2 (Content Type / Source)
040 $f (Cataloging Source / Subject heading / thesaurus conventions 

Holdings records

337 $2 (Media Type / Source)
338 $2 (Carrier Type / Source)

Bibliographic records

656 $2 (Index Term – Occupation / Source of term)

Authority records

374 $2 (Occupation / Source of term)

Community Information records

656 $2 (Index Term – Occupation / Source of term)

Bibliographic records

657 $2 (Index Term – Function / Source of term)

Community Information records

657 $2 (Index Term – Function / Source of term)

Bibliographic records

600-651, 654, 662 $2 -- See above: Subject Heading and Term Source Codes
751 $2 (Added Entry – Geographic Name / Source of heading or term)
752 $2 (Added Entry – Hierarchical Place Name / Source)

Authority records

700-788 $2 (Heading Linking Entries / Source of heading or term)

MARC Report will join all of the source codes from the following lists–

Subject Heading and Term Source codes 
Genre/Form Term and Code Source Codes 
Occupation Term Source Codes
Function Term Source Codes 
Name and Title Authority Source Codes 

–into a single list of 'subject codes', and these codes will be considered valid in all of the tags listed below:

Bibliographic records

033 $2 (Date/Time and Place of an Event / Source of place term)
257 $2 (Country of Producing Entity / Source)
336 $2 (Content Type / Source)
337 $2 (Media Type / Source)
338 $2 (Carrier Type / Source)
380 $2 (Form of Work / Source of term)
381 $2 (Other Distinguishing Characteristics of Work or Expression / Source)
518 $2 (Date/Time and Place of Event Note / Source of term)
600-651 $2 (Subject Added Entry / Source of heading or term)
654 $2 (Subject Added Entry -- Faceted Topical Term / Source) 
655 $2 (Index Term – Genre/Form / Source of term)
656 $2 (Index Term – Occupation / Source of term)
657 $2 (Index Term – Function / Source of term)
662 $2 (Subject Added Entry – Hierarchical place name / Source) 
751 $2 (Added Entry – Geographical Name / Source of heading or term) 
752 $2 (Added Entry – Hierarchical Place Name / Source) 

Authority records

040 $f (Cataloging Source / Subject heading / thesaurus conventions
700-788 $2 (Heading Linking Entries / Source)
336 $2 (Content Type / Source)
370 $2 (Associated Place / Source of term)
372 $2 (Field of Activity / Source of term)
373 $2 (Affiliation / Source of term)
374 $2 (Occupation / Source of term)
376 $2 (Family Information / Source of term)
380 $2 (Form of Work / Source of term)
381 $2 (Other Distinguishing Characteristics of Work or Expression / Source)

Community Information records

600-651 $2 (Subject Added Entry / Source of heading or term)
654 $2 (Subject Added Entry -- Faceted Topical Term / Source) 
656 $2 (Index Term – Occupation / Source of term)

Holdings records

337 $2 (Media Type / Source)
338 $2 (Carrier Type / Source)