Mary Holland contributed to which field of fingerprint research?

Mary Holland is recognized for her significant contributions to the field of fingerprint research through her involvement in teaching and sharing knowledge, particularly highlighted by her role in delivering American Fingerprinting Lectures. These lectures have been influential in educating practitioners and expanding the understanding of fingerprinting techniques, principles, and applications within forensic science. Her emphasis on the educational aspect underlines the importance of disseminating information to enhance the skills of those working in the field.

The other options, while they pertain to various techniques and advancements in fingerprinting, do not specifically link to her work and influence as an educator and speaker in the discipline. Thus, her legacy is more closely associated with the sharing and propagation of knowledge rather than the direct development of specific techniques or applications.