What is a 1891 copy of Rules Order worth?

"Rules of Order" by Henry M. Robert was first published in 1876. There was possibly an 1891 edition, although it is not well-known and may be rare. As such, its value would depend on its condition, rarity, and demand among collectors.

To accurately determine its worth, it would be best to consult with an expert in rare book appraisal or book dealer specializing in antique and rare books. They can assess its condition, determine its rarity, and provide an estimated value based on market trends.