The Condensed Chemical Dictionary by James A. Oberly, Second Edition, published in 1930, is a foundational reference work for chemistry. It offers a snapshot of chemical knowledge in the 1930s, reflecting the terminology and understanding of the era. Providing concise definitions and descriptions of chemical terms, compounds, and elements, it covers a wide range of topics, from inorganic and organic chemistry to chemical processes and industries. Despite its age, it remains a valuable resource for historical context and understanding the evolution of chemical terminology and knowledge.