(g) I.S. (0) will be responsible for indicating to I.S.T.D. what topographical information is wanted for the operation, whether as amendments in amplification of existing reports, or "ab initio" reports and how many copies of the I.S.I.S. will be required. (h) I.S. (0) will be responsible for co-ordinating and submitting demands for all photographs through A.D.Ph. (I) required by the J.P.S. and Force Commanders in connection with the operation. 3. Sources of Information. I.S. (0) will obtain intelligence from the following sections and departments: (a) The appropriate Sections of the various Ministries.