  Observatories need to measure and evaluate the scientific output and overall
impact of their facilities. An observatory bibliography consists of the papers
published using that observatory's data, typically gathered by searching the
major journals for relevant keywords. Recently, the volume of literature and
methods by which the publications pool is evaluated has increased. Efficient
and standardized procedures are necessary to assign meaningful metadata; enable
user-friendly retrieval; and provide the opportunity to derive reports,
statistics, and visualizations to impart a deeper understanding of the research
output. In 2021, a group of observatory bibliographers from around the world
convened online to continue the discussions presented in Lagerstrom (2015). We
worked to extract general guidelines from our experiences, techniques, and
lessons learnt. The paper explores the development, application, and current
status of telescope bibliographies and future trends. This paper briefly
describes the methodologies employed in constructing databases, along with the
various bibliometric techniques used to analyze and interpret them. We explain
reasons for non-standardization and why it is essential for each observatory to
identify metadata and metrics that are meaningful for them; caution the
(over-)use of comparisons among facilities that are, ultimately, not comparable
through bibliometrics; and highlight the benefits of telescope bibliographies,
both for researchers within the astronomical community and for stakeholders
beyond the specific observatories. There is tremendous diversity in the ways
bibliographers track publications and maintain databases, due to parameters
such as resources, type of observatory, historical practices, and reporting
requirements to funders and outside agencies. However, there are also common
sets of Best Practices.
