Question: What is ISBN UK, when Author is "Dave Martin", and when ISBN US is "n/a"?
SQL: SELECT "ISBN UK" FROM "2-1713215-1" WHERE "Author" = 'Dave Martin' AND "ISBN US" = 'n/a';

Question: What is ISBN US, when Title is "Crisis in Space"?
SQL: SELECT "ISBN US" FROM "2-1713215-1" WHERE "Title" = 'Crisis in Space';

Question: What is Author, when TV Companions Featured is "Peri Brown", and when Title is "Race Against Time"?
SQL: SELECT "Author" FROM "2-1713215-1" WHERE "TV companions featured" = 'Peri Brown' AND "Title" = 'Race Against Time';

Question: What is Title, when TV Companions Featured is "K-9"?
SQL: SELECT "Title" FROM "2-1713215-1" WHERE "TV companions featured" = 'K-9';

Question: What is ISBN US, when Title is "Mission to Venus"?
SQL: SELECT "ISBN US" FROM "2-1713215-1" WHERE "Title" = 'Mission to Venus';

Question: What is TV Companions Featured, when Author is "William Emms"?
SQL: SELECT "TV companions featured" FROM "2-1713215-1" WHERE "Author" = 'William Emms';