Though my late paternal grandmother warned me about the Lutheran Church-Missouri Synod being “crazy” they do produce some good resources, both individually and as a church.
One is the Christian Cyclopedia they have hosted on the denominational website; it is a digital version of a printed reference work. Great if you need a two-line or two-paragraph answer to questions like “What a Jansenist?” Of course, if your question is Lutheran related, you get finer detail.