How did Mesopotamia's use a calendar?

Where does gretel think are? What has the author R G Edwards written? Should be done when a reference has more than six authors? What rhymes with obviously? What page is ineffectual found in lord of the flies? Who are the character in the story Big sister? What does Montag mean when he says that he wants to hold onto the world? What is the longest snake ever recorded? How do you know a book or website is valid? How does the MBNQA relate to your current organization? In the book holes what was Mr Sir's role? What does Quintilian contribute to your understanding of persuasion today? What page in Fahrenheit 451 does montage shows mildred the books? How do you make a legend on National Geographic mapmaker? Amir and sorayas relationship? What is the problem in The Red Badge of Courage? What has the author H D Ruffin written? Who is Odin in Beowulf? What are baker's hours like? How do you say read in spanish?

How did Mesopotamia's use a calendar?