- Maas, Sarah J.
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- Mack, David
- MacKay, Nina
- MacKenzie, Ross
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- MacLeod, Ian R.
- MacLeod, Ken
- Macneal, Elizabeth
- MacNiven, Robbie
- Macri, Thomas
- Maddox, Tom
- Mafi, Tahereh
- Magrs, Paul
- Maguire, Gregory
- Mahanenko, Vasily
- Mahlow, Christian
- Mahr, Daphne
- Maikranz, D. Eric
- Maine, Charles Eric
- Major, Heike M.
- Malerman, Josh
- Malfi, Ronald
- Malzberg, Barry N.
- Mamatas, Nick
- Mamczak, Sascha
- Mammay, Michael
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- Mangin, Loïc
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- Mann, George
- Mann, Phillip
- Manning, Michael
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- Marc, John
- Marcus, Ben
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- Marewski, Nina Maria
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- Marion, Isaac
- Marley, Louise
- Marmell, Ari
- Marrak, Michael
- Marrs, John
- Mars, Liane
- Marsh, Richard
- Marshall, Alex
- Marshall, Kate Alice
- Marske, Freya
- Martell, Nick
- Martin, Alicia S.
- Martin, Gail
- Martin, George R. R.
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- Martin, Michael A.
- Martin, Nina
- Martin, Tom
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- Maxwell, Lisa
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- May, Nina F.
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- Mayer, Shannon
- Mayerhofer, Jacqueline
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- McCaffrey, Anne
- McCammon, Robert R.
- McCarthy, Wil
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- McCurdy, Janelle
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- McDermott, Kirstyn
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- McDonald, Ed
- McDonald, Ian
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- McEntire, Myra
- McFall, Claire
- McGann, Oisín
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- McGeorge, Chris
- McGonigal, Jane
- McGrew, Chandler
- McGuire, Seanan
- McIlwaine, Catherine
- McIntee, David A.
- McIntire, Emily
- McIntosh, Fiona
- McIntyre, Gina
- McIntyre, Vonda N.
- McKenzie, Shane
- McKiernan, Dennis L.
- McKillip, Patricia A.
- McKinney, L. L.
- McLaughlin, Rebecca
- McLean, Peter
- McMullen, Sean
- McQuay, Mike
- Mead, Richelle
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- Meier, Christian J.
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- Meiser, Michael
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- Meißner, Tobias O.
- Melchiorri, Anthony J.
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- Meluch, R. M.
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- Menschig, Diana
- Mer, Lilach
- Merle, Robert
- Merow, Alexander
- Merritt, Abraham
- Merten, Peter
- Mertens, J.
- Messenger, Shannon
- Mette, Michael
- Metzen, Chris
- Metzger, Christian
- Meyer, Joseph A.
- Meyer, Kai
- Meyer, Marissa
- Meyer, Olivia
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- Meyer, Stephenie
- Mi-ye, Lee
- Michaelis, Antonia
- Mielke, Lars
- Miesen, Georg
- Mikati, Gitta
- Mikuta, Zoe Hana
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- Millar, Martin
- Miller jr., Walter M.
- Miller, Frank
- Miller, John Jackson
- Miller, Karen
- Miller, Laura
- Miller, Madeline
- Miller, Matthew
- Millwood Hargrave, Kiran
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- Miro, J. M.
- Mirrlees, Hope
- Mitchell, David
- Mitchell, V. E.
- Miéville, China
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- Moers, Walter
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- Mon, Mika D.
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- Moore, Stuart
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- Morgan, Chris
- Morgan, Kass
- Morgan, Lara
- Morgan, Lily S.
- Morgan, Richard
- Morgan, Robert
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- Morger, Fabia
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- Morrell, David
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- Morris, Janet
- Morris, Jonathan
- Morris, William
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- Myers, Eugene
- Möhlmann, Roman
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- Müller, Sebastian
- Müller, Xavier
- Müller-Braun, Dana
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