This book constitutes the proceedings of the 23rd International Conference on Theory and Practice of Digital Libraries, TPDL 2019, held in Olslo, Norway, in September 2019. The 16 revised full papers,12 short papers and 18 poster papers presented were carefully reviewed and selected from 75 submissions.

Coner: A Collaborative Approach for Long-Tail Named Entity Recognition in Scientific Publications.- An unsupervised method for concept association analysis in text collections.- Linking Semantic Fingerprints of Literature.- Learning to Rank Claim-Evidence Pairs to Assist Scientific-Based Argumentation.- The OpenAIRE Research Community Dashboard: on Blending Scientific Workows and Scientific Publishing.- A Framework for Citing Nanopublications.- Analysis of Transaction Logs from National Museums Liverpool.- Knowledge Graph Implementation of Archival Descriptions through CIDOC-CRM.- Investigating Correlations of Inter-coder Agreement and Machine Annotation Performance for Historical Video Data.- Who is Mona L.? Identifying Mentions of Artworks in Historical Archives.- Gatekeeper: Quantifying the Impacts of Service to the Scientific Community.- A Study on the Readability of Scientific Publications.- Interdisciplinary Collaborations in the Brazilian Scientific Community.- Exploring Scholarly Data by Semantic Query on Knowledge Graph Embedding Space.- The Memento Tracer Framework: Balancing Quality and Scalability for Web Archiving.- The immigration dilemma; Legal, ethical and practical issues in creating a living, growing archive.- Segmenting User Sessions in Search Engine Query Logs Leveraging Word Embeddings.- A Human-friendly Query Generation Frontend for a Scientific  Events Knowledge Graph.- User Interface for Interactive Scientific Publications: A Design Case Study.- Stable Word-clouds for Visualising Text-changes over Time.- A Hierarchical Label Network for Multi-Label EuroVoc Classification of Legislative Contents.- Can Language Inference Support Metadata Generation?.- Information Governance Maturity Assessment using Enterprise Architecture Model Analysis and Description Logics.- Finding Documents Related to Taiwan in the Veritable Records of Qing Using Relevance Feedback.- Fake News Detection with the New German Dataset "GermanFakeNC".- The CSO Classifier:Ontology-Driven Detection of Research Topics in Scholarly Articles.- Non-parametric Subject Prediction.- Visual Summarization of Scholarly Videos using Word Embeddings and Keyphrase Extraction.- Towards Serendipitous Research Paper Recommender using Tweets and Diversification.- Enriching the Cultural Heritage Metadata Using Historical Events: a Graph-Based Representation.- Open Research Knowledge Graph: A System Walkthrough.- The Biodiversity Heritage Library: Unveiling a World of Knowledge About Life on Earth.- Clipping the Page { Automatic Article Detection and Marking Software in Production of Newspaper Clippings in a Digitized Historical Journalistic Collection.- Document recommendations in Slovenian academic digital libraries.- An Evaluation of the Effect of Reference Strings and Segmentation on Citation Matching.- A la Carte: Turning Historical Menu into Menu Network.- Semantic Representation of Scientific Publications.- Determining How Citations Are Used in Citation Contexts.-Dendro: a FAIR, open-source data sharing platform.- User's Behavior in Digital Libraries: Process Mining Exploration.- SciTo Trends: Visualising Scientific Topic Trends.- The-Shelf Semantic Author Name Disambiguation for Bibliographic Data Bases.- Rending Behaviour in Educational Search.- Qatar Digital Library as a Platform for Digital Repatriation of Qatar's Cultural Heritage.- Correcting and redesigning metadata for the excavation of an archaeological site.- Topic Modelling vs Distant Supervision: A Comparative Evaluation based on the Classification of Parliamentary Enquiries.