If you mean Pandit Dhirajlal Tokarshi Shah, some of his Jain books include:

• Bhaktamara Rahasya ( jainqq.org)
• Mantra Vigyan ( jainqq.org)
• Jinopasna ( jainqq.org)
• Jinbhakti Kalptaru ( jainqq.org)
• Jiva Vichar Prakashika yane Jain Dharma nu Prani Vigyan ( jainqq.org)

If you mean Pandit Dhirajlal D. Mehta, his Jain works include:

• Jain Dharma na Maulik Siddhanto ( jainqq.org)
• Yogashatak ( jainqq.org)
• Samyaktva Mul Bar Vrat ( jainqq.org)
• Pooja Sangraha with Meaning Tika ( jainqq.org)
• Snatrapooja Sarth ( jainqq.org)

If you want, I can also give you a longer book list for either of these authors.