Another valuable information source for publishers is mpa.org, the Music Publishers Association of the United States.

Here's their listing for TRO:

TRO Inc. (The Richmond Organization)
266 West 37th Street, 17th Floor
New York NY 10018
Clearance Representative:
Judy Bell
Email:
copyright@songways.com
Member Affiliation:
National Music Publishers Association
Phone:
212-594-9795
Fax:
212-594-9782
Imprints Held:
• Words and Music, Inc. *

  Worldwide Music Services, Inc. *

  Total Music Services, Inc. *

  TRO Inc. *

  Musical Comedy Productions, Inc. *

  Melody Trails, Inc. *

  Ludlow Music, Inc. *

  Hollis Music, Inc. *

  Hampshire House Publishing Corp. *

  Folkways Music Publishers, Inc. *

  Essex Music International, Inc. *

  Essex Music, Inc. *

  Devon Music, Inc. *

  Cromwell Music, Inc. *

  Cheshire Music, Inc. *

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woodyguthrie.org (click) has a very good page that tells how to contact the publishers of Woody's songs. The list also works for the songs of Pete Seeger, Lead Belly, and many other U.S. songwriters from the Folk Scare.

I had lots of fun contacting these publishers to get permissions for songs we used in the Rise Again Songbook. For print permissions, I had to contact the publishers individually and directly, and each one executed a license with our publisher, Hal Leonard (Hal Leonard already has arrangements with many publishers, so that made things considerably easier). To record a song, U.S. musicians can usually go to the Harry Fox Agency, https://www.harryfox.com/ and buy licenses online.

-Joe-