The correspondents are:
File 1: Mr Sid Mackenzie, Dr David T Maclay, Dr Donald I MacLeod, Dr John Maddox (Editor, Nature), Leonard Maler, Markos Maniatis, Dr K Manis, Mr E T Manning, Dr Robin Marris, Ms Maureen Marsh, Mr Alexander Marshack, Dr John C Marshall, Prof Roger D Masters, Mr Robert A J Matthews, Dr J Mazana C [sic], Mr Rick Maxson, John C Mazziotta, Mr Ryan McCallum, Ann McCarthy, Robert McConnell, Mr Jack McDevitt, Prof M E McIntyre, Stuart J McKelvie, and Robin McKie.
File 2: Mr Michael O'Keefe (Executive Vice President, The McKnight Foundation), Ms Betty McMahon, Mr Charles R McMillan, Norm McPhail, Medailles, Medical News Network, Dr Theodore Melnechuk, Ms Corinne Mentzelopoulos, Prince Michael of Kent, Mrs Polly Middleton, Dr James Grier Miller, Ryle Miller, William R Miller, Prof A David Milner, Howard G Milstein, The MIT Press, Mr David A Mitchell, and Dr Graeme Mitchison.
File 3: P Read Montague, R F Moore, John Moore, Bob Moorhouse, Dr Zygmunt Morawski, Dr John H Morrison, Mr Sidney G Morton, John de S Mosely, Vernon B Mountcastle, Dr Michael C Mozer, Dr Jorge Mpodozis, Dr Scott J Mubarak, Tapan Kumar Mukherjee, Dr A K Mukhopadhyay, Jeffrey C Murray, and Jacob Murre & Daniel Sturdy.
A letter detailing sensitive personal circumstances has been extracted to files PP/CRI/J/1/4/23.