I want to know the answer to the following question:
In what year was S. Wanradt and J. Koell's book written?
All the background I'm provided with is that "The first extant Estonian book is a bilingual German-Estonian translation of the Lutheran catechism by S. Wanradt and J. Koell dating to 1535, during the Protestant Reformation period.". Is that enough to answer the question?
Answer: yes