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In 1861 , he published his final work , The Young Gardener ’s Educator , described as being a series of lessons , in the conversational style , on subjects generally considered necessary for the young gardener to understand , viz. : English grammar , geology , botany , vegetable physiology , horticultural chemistry , physical geography , entomology , land measuring , architectural drawing , letter writing , penmanship , the measurement of artificer ’s work connected with gardening , etc. .
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Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
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