31328
From about 1930 , these short documentaries were almost exclusively written , produced and directed ( and occasionally edited and narrated ) by Ralph Staub , until the series was discontinued in 1958 .
 Ralph Staub
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:
 Ralph Staub