The chap books are staple-bound;  most include one or two essays by a single author, and some were later released in other formats.  Also included here are other staple bound titles, including catalogs.  About half I have not seen personally, and have very scant information regarding them.  But, there are enough of them that they seemed to warrant a page...
Chap books, Pamphlets, Catalogs

J.R.R.Tolkien (Essays on Modern Writers)

Columbia University Press, Catharine R. Stimpson

1969 Pamphlet   ISBN : 0231032072

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0231032072

A Glossary of Eldarin Tongues

James D. Allan

1972 Pamphlet   ISBN : 0

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Funeral Customs In Tolkien's Trilogy

T-K Graphics, Karen Rockow

1973 Pamphlet   ISBN : 0

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Myth, Symbol And Religon In Lord Of The Rings

T-K Graphics, Sandra Miesel

1973 Pamphlet   ISBN : 0

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Men, Halflings & Hero Worship

T-K Graphics, Marion Zimmer Bradley

1973 Pamphlet   ISBN : 0

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Tree by Tolkien

Covent Garden Press; INCA Books, Colin Wilson

1973 Softcover   ISBN : 0902843621

Capra Press

1974 Softcover   ISBN : 0912264969

1974 Hardcover   ISBN : 0912264977

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0902843621
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0912264969
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0912264977

Mithrandir

T-K Graphics, Stephen O. Miller

1974 Pamphlet   ISBN : 0

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Middle Earth: A World In Conflict

T-K Graphics, Stephen O. Miller

1975 Pamphlet   ISBN : 0

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Of Orc-Rags, Phials & a Far Shore :
Visions Of Paradise In Lord Of The Rings

TK Graphics, Bruce Palmer

1975(6?) Pamphlet   ISBN : 0

Bran's Head

1981(2?) Pamphlet   ISBN : 0905220307

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A Speculation on The Silmarillion

James D. Allan

1977 Pamphlet   ISBN : 0

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Eglerio! In Praise of Tolkien

Quest Communications

1978 Pamphlet   ISBN : 0

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Lightning from a Clear Sky :
Tolkien, The Trilogy, and the Silmarillion

Borgo Press, Richard Mathews

1978 Softcover   ISBN : 0893702218

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0893702218

J.R.R. Tolkien :  The Hobbit :
Drawings, Watercolors and Manuscripts from

Marquette University Press
Haggerty Museum of Art Exhibition catalogue Illustrations, biography, bibliography and list of works shown in the exhibition

1987 Softcover   ISBN : N/A

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The Shaping of Middle-Earth's Maker :
Influences on the Life and Literature of J.R.R. Tolkien

American Tolkien Society, John S. Ryan

1992 Softcover   ISBN : 1881799034

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1881799034

The Invented Worlds of J.R.R. Tolkien :
Drawings and Original Manuscripts from the Marquette University Collection

Marquette University Press
Haggerty Museum of Art 2004 Exhibition 44 page catalogue.  Three essays, 10 color illustrations by J.R.R. Tolkien, and bibliography

2006 Softcover   ISBN : N/A

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