My older sibling had a copy of Bjo's Concordance—but would rarely let me touch it. I still remember the little index wheel built into the saucer of the Enterprise on the cover.
I think that's why I was so happy to get my copy of Allan Asherman's Compendium five years later—because of my sibling's stinginess!
Passion and Stinginess run deep when it comes to our Star Trek Precious! Glad you got your own!!!