72426
The gravesite ( " vide " coordinates above ) is marked by a headstone ; nearby stands a pyramid memorial erected by the Watch Tower Bible and Tract Society in 1921 .
 Watch Tower Bible and Tract Society
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
Answer:
 Watch Tower Bible and Tract Society