[{"source_document_id":106,"title":"Daniels planting guide, 1950","url":"https://archive.org/download/CAT31385782/CAT31385782.pdf","rights_status":"unknown","evidence_claim_count":6,"relationship_count":0,"history_event_count":0,"sample_snippets":["The entry calls it probably the best blackberry for home and commercial plantings in the North.","Plants are described as very productive.","Plants are described as vigorous.","The entry says it is the best in quality among the better blackberries."]},{"source_document_id":139,"title":"Planting time, 1950 / Alpha Nursery","url":"https://archive.org/download/CAT31385295/CAT31385295.pdf","rights_status":"unknown","evidence_claim_count":6,"relationship_count":0,"history_event_count":0,"sample_snippets":["Catalog states the nursery thinks this is the best of blackberries.","Fruit described as jet black.","Fruit described as very large.","Described as extra fine quality with sweet flavor and without core."]},{"source_document_id":105,"title":"Hardy fruits for Northern planting, trees, shrubs, 1937","url":"https://archive.org/download/CAT31349771/CAT31349771.pdf","rights_status":"unknown","evidence_claim_count":2,"relationship_count":0,"history_event_count":0,"sample_snippets":["Listed in the price table as Alfred, 1-yr. Standard and Alfred, 2-yr. Heavy.","Listed under blackberry."]}]