Which statement is true regarding American Law Reports?

American Law Reports (ALR) are compilations that provide summaries and analyses of significant legal issues as interpreted through various court decisions across multiple jurisdictions. The true statement regarding ALR is that it is a well-known source of primary authority. This is because ALRs compile and analyze case law, which is considered primary authority in legal research. These reports help legal practitioners understand how courts have interpreted specific legal principles across different cases, allowing them to support legal arguments with authoritative references.

The other statements do not accurately reflect the nature of American Law Reports. ALR does not limit itself solely to federal legal opinions; instead, it encompasses significant case law from both federal and state courts. It is not merely an encyclopedia of law because, while it provides valuable insights and analysis, it does not cover every aspect of the law nor does it serve as a comprehensive reference source like an encyclopedia would. Finally, ALR is not comprised solely of state law, as it also includes federal cases, making it a broader resource than just state-specific legal materials.