The following works may be helpful in doing research for your papers:

Bodensieck, Julius, ed. The Encyclopedia of the Lutheran Church. Minneapolis: Augsburg, 1965. [in reference section]

Bonderud, Omar and Charles Lutz. America’s Lutherans. Columbus: Wartburg Press, 1955.

Finck, William J. Lutheran Landmarks and Pioneers in America: A Series of Sketches of Colonial Times. Philadelphia: United Lutheran Publication House, 1913. [contains photos]

Gilbert, W. Kent. Commitment to Unity: A History of the Lutheran Church in America.
Philadelphia: Fortress Press, 1988.

Gritsch, Eric W. Fortress Introduction to Lutheranism. Minneapolis: Fortress Press, 1994. [brief overview of worldwide Lutheran history that may help to put American developments
into a broader perspective]

Gustafson, David A. Lutherans in Crisis: The Question of Identity in the American Republic.
Minneapolis: Fortress Press, 1993.

Lagerquist, L. DeAne. The Lutherans. Westport, Conn.: Praeger, 1999.

Lueker, Erwin L., ed. Lutheran Cyclopedia. St. Louis: Concordia Publishing House, 1975. [in reference section]

Lutz, Charles P. Church Roots. Minneapolis: Augsburg Publishing House, 1985. [ethnic groups of ALC]

Meyer, Carl S., ed. Moving Frontiers: Readings in the History of the Lutheran Church Missouri Synod. St. Louis: Concordia Publishing House, 1964.

Nelson, E. Clifford. Lutheranism in North America: 1914-1970. Minneapolis: Augsburg, 1972.

Nelson, E. Clifford, ed. The Lutherans in North America. Rev. ed. Philadelphia: Fortress Press, 1980.

The Notebook of a Colonial Clergyman, Condensed from the Journals of Henry Melchior
Muhlenberg. Translated and edited by Theodore G. and John W. Doberstein.
Philadelphia: Muhlenberg Press, 1959.

Olson, Oliver K., ed. The Church in New Sweden. Milwaukee: Lutheran Quarterly, 1988.

Pannkoke, Otto Hermann. A Great Church Finds Itself: The Lutheran Church between the Wars. Quitman, G.: [published by author], 1966.

Peterson, William H. and Robert Goeser. Traditions Transplanted: The Story of Anglican and Lutheran Churches in America. Cincinnati: Forward Movement Publications, 1981.
[very brief summary]

Qualben, Lars Pederson. The Lutheran Church in Colonial America. New York: Nelson, 1940.

Spitz, Lewis W. The Life of Dr. C.F.W. Walther. St. Louis: Concordia Publishing House, 1961.

Tietjen, John H. Which Way to Lutheran Unity?: A History of Efforts to Unite the Lutherans of America. St. Louis: Concordia Publishing House, 1966.

Wentz, Abdel Ross. A Basic History of Lutheranism in America. Philadelphia: Muhlenberg
Press, 1955.

Wentz, Frederick K. Lutherans in Concert: The Story of the National Lutheran Council, 1918- 1966. Minneapolis: Augsburg Publishing House, 1968.

Wiederaenders, Robert C. and Walter G. Tillmanns. The Synods of American Lutheranism.
Lutheran Historical Conference, 1968. [has helpful charts]

Wolf, Richard C. Documents of Lutheran Unity in America. Philadelphia: Fortress Press, 1966.

The Lutheran Quarterly. [This journal specializes in Lutheran history and has had many interesting articles on the history of Lutheranism in the United States.]

Note: This bibliography is mostly limited to fairly recent works that deal with the history of American Lutheranism in a more general way. The library has many other resources that focus on particular persons, places, geographical areas or topics.