Explanatory Memoranda are not issued separately for Bills. However, since October 1977, the last part of a minister's second reading speech, giving a clause-by-clause explanation of a Bill, has been subtitled Explanation of Clauses. See the second reading speech for each Bill in the South Australian Hansard
For information about Acts and subordinate legislation that ceased operation before 1 January 1976, consult the Tables and Indexes in Volume 9 South Australian Statutes 1837-1936 and, for Acts, the 1975 Volume of South Australian Statutes. These volumes are available in the Law Library