Lou Harrison microtonal work for strings?

Greetings,

Does anyone know if any of the following by Lou Harrison involve microtones?

http://www2.hmc.edu/~alves/harrisonworks.html

1960 (uses sketches that go back to 1936) Suite for Symphonic Strings for String orchestra; Publisher: C. F. Peters; Recording: Louisville LOU-621 LP (1962): Louisville Orch. cond. Robert Whitney.

1970 Air in G minor for Strings

1995 New First Suite for Strings for string orchestra. Publisher: Peer, Recording: MHS 515721, Denis Russell Davies cond. Brooklyn Philharmonic. Revision of First Suite for Strings (1947-48).

1997 Suite for Violin and Strings for Violin, strings (Arrangement of suite for Violin and American Gamelan)

Thank you,
Dr. Oz.

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www.ozanyarman.com