Sentence:  After the best sections had been chosen, the rejected ones had to be cut up into 80-acre sections, and <WSD>green slips</WSD> as they were called ; and then the 80-acre land orders might be exercised. 
Meaning of the word marked with <WSD> tags:  A portion of Crown land remaining unalienated due to a size discrepancy between the land survey and the actual division.<ref>“'''[http://books.google.com.au/books?id=B7tZAAAAMAAJ&q=%22green+slip%22|%22green+slips%22+australia+-intitle:%22%22+-inauthor:%22%22&dq=%22green+slip%22|%22green+slips%22+australia+-intitle:%22%22+-inauthor:%22%22&hl=en&sa=X&ei=cmFsT-esB4bNmQXc7ISyBg&redir_esc=y green slip]'''”, entry in '''1989''', Joan Hughes, "Australian Words and Their Origins", page 241.</ref>