| Operation East Timor: The New Zealand Defence Force in East Timor, 1999-2001 JAB Crawford, G Harper Reed Publishing (NZ), 2001 | 36 | 2001 |
| Kippenberger: An Inspired New Zealand Commander G Harper HarperCollins, 2005 | 34 | 2005 |
| Letters from Gallipoli: New Zealand soldiers write home G Harper Auckland University Press, 2013 | 33 | 2013 |
| Johnny Enzed: The New Zealand Soldier in the First World War 1914-1918 G Harper | 29 | 2015 |
| Dark Journey: Three key NZ battles of the western front G Harper HarperCollins Australia, 2013 | 25 | 2013 |
| Massacre at Passchendaele: The New Zealand Story G Harper FireStep Books, 2011 | 24 | 2011 |
| Mortality of first world war military personnel: comparison of two military cohorts N Wilson, C Clement, JA Summers, J Bannister, G Harper Bmj 349, 2014 | 22 | 2014 |
| The use of gas phase detection and monitoring of potato soft rot infection in store MF Rutolo, JP Clarkson, G Harper, JA Covington Postharvest biology and technology 145, 15-19, 2018 | 19 | 2018 |
| A nutritional analysis of New Zealand military food rations at Gallipoli in 1915: likely contribution to scurvy and other nutrient deficiency disorders N Wilson, N Nghiem, JA Summers, MA Carter, G Harper The New Zealand Medical Journal (Online) 126 (1373), 2013 | 19 | 2013 |
| Letters from the Battlefield: New Zealand Soldiers Write Home, 1914-18 G Harper HarperCollins, 2001 | 19 | 2001 |
| In the face of the enemy: The complete history of the Victoria Cross and New Zealand G Harper HarperCollins Australia, 2010 | 16 | 2010 |
| Potatoes C Bishop, D Rees, MUA Cheema, G Harper, G Stroud Crop Post‐Harvest: Science and Technology: Perishables, 334-359, 2012 | 15 | 2012 |
| Born to Lead?: Portraits of New Zealand Commanders G Harper, J Hayward Exisle Publishing, 2014 | 13 | 2014 |
| The Battle for North Africa: El Alamein and the Turning Point for World War II G Harper Indiana University Press, 2017 | 12 | 2017 |
| Fatal injury epidemiology among the New Zealand military forces in the First World War N Wilson, JA Summers, MG Baker, G Thomson, G Harper The New Zealand Medical Journal (Online) 126 (1385), 2013 | 11 | 2013 |
| New Faces for Mutilated Soldiers G Harper Red Cross Magazine 13, 4444, 1918 | 9 | 1918 |
| The health impacts of the First World War on New Zealand: a summary and a remaining research agenda N Wilson, G Thomson, JA Summers, G Harper, J Horrocks, E Roberts Australian and New Zealand journal of public health 42 (6), 516-518, 2018 | 6 | 2018 |
| Spring offensive: New Zealand and the second Battle of the Somme G Harper HarperCollinsPublishers (New Zealand), 2003 | 6 | 2003 |
| For King and Other Countries: The New Zealanders who Fought in Other Services in the First World War G Harper, C Clement, R Johns Massey University Press, 2019 | 4 | 2019 |
| Roly, the ANZAC Donkey G Harper, J Cooper Puffin Books, 2015 | 4 | 2015 |
