One posibility
la biblioteca sucursal de la escuela primaria Marguerite Montgomery del condado de Yolo...

http://www.djusd.k12.ca.us/Montgomery/index.html

Bibliotecas sucursales
Estas bibliotecas, de pequeño tamaño, pretenden estar cerca del ciudadano, evitando que se tenga que desplazar al centro de la ciudad. Disponen de una pequeña colección generalista (de 10.000 a 12.000 documentos), que incluye obras de consulta, y una colección para préstamo integrada principalmente por obras literarias y de entretenimiento, películas y obras multimedia, así como de una colecciòn de libros infantiles y juveniles.
http://www.bibliotecaspublicas.es/mostoles/guia.htm

Juan Pablo:

I read your question asking about the meaning of MME branch and I immediately thought in my own experience related with libraries that have different branches across a territory or district.

In Broward Library (Broward County, Florida), I was working in an academic program and I remember that the name “branch” was the equivalent to “library”.

Broward County in South Florida has a main branch (or central library) in Fort Lauderdale Downtown and more than 30 other branches located across the county: Dania, Hollywood… and some small offices in special communities.

By the way, some of these libraries are linked with schools and other community institutions of the towns and cities that are part of the Broward County. Each branch is named with the proper name of the “place” plus the name “library”.

Additionally, I saw that Dade County uses similar criteria to name each branch. In the case of Dade County, the main library is Miami Downtown Library, but there are big and small libraries across different neighborhood of Miami, and in the cities of Coral Gables, Miami Beach and other cities that are part of Dade County. For example, the library of Coral Gables is named Coral Gables Library.

Following this criteria used in Florida, USA, in this case I have to say: “Marguerite Montgomery Elementary Library”.

I hope this analysis helps you in your work.

Thank you,

Domingo


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Note added at 21 hrs (2012-05-30 23:28:15 GMT)
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Other option:

“Marguerite Montgomery Elementary School Library”.