Which book is this?

Tunnel 29 : Love, Espionage and Betrayal (2021) · Helena Merriman Tunnel 29 (2021) · Helena Merriman Tunnel 29 Lib/E (2021) · Helena Merriman

Summary of Helena Merriman's Tunnel 29 (2022) · Irb Media

The Secret of the Lost Tunnel (Hardy Boys, No. 29) (1968) · Leslie McFarlane

X-29A longitudinal and directional force and moment supplemental transonic wind tunnel test results (1984) · Albion H. Bowers

International Conference Tunnelling Asia '2000, 26-29 September, New Delhi, India (2000) · International Conference Tunnelling Asia '2000 (2000 New Delhi, India) Papers presented at the 6th International Symposium on the Aerodynamics and Ventilation of Vehicle Tunnels, Durham, UK: 27-29 September, 1988 (1988) · International Symposium on the Aerodynamics and Ventilation of Vehicle Tunnels (6th 1988 Durham, England)

Wind tunnel performance results of an aeroelastically scaled 2/9 model of the PTA flight test prop-fan (1987) · George L. Stefko

Pressure distribution data from tests of 2.29-meter (7.5-ft.) span EET high-lift research model in Langley 4- by 7-meter tunnel (1982) · Harry L. Morgan