Terms: Seismic Exploration (605,000), petroleum exploration (2,430,000), minerals exploration (508,000), coal exploration (261,000), gas exploration (10,100,000), oil exploration (7,540,000),
Terms: hydrocarbon exploration (323,000), exploration company (4,000,000), exploration companies (1,500,000), exploration industry (730,000),
Boolean: "petroleum exploration" +acoustic (33,600), "petroleum exploration" +electromagnetic (36,300), "petroleum exploration" +gravity (89,400), "petroleum exploration" +seismic (334,000), "petroleum exploration" +ultrasonic (4,970), "petroleum exploration" +infrasonic (46), "petroleum exploration" +magnetic (82,500), "petroleum exploration" +resistivity (23,500), "petroleum exploration" +"magnetic resonance" (5,500), "petroleum exploration" +electric (199,000),
Boolean: "petroleum exploration" +microhertz (0), "petroleum exploration" +millihertz (2), "petroleum exploration" +hertz (3,020), "petroleum exploration" +khz (1,460), "petroleum exploration" +mhz (1,980), "petroleum exploration" +ghz (1,950), "petroleum exploration" +thz (30), "petroleum exploration" +petahertz (0), "petroleum exploration" +infrared (17,400), "petroleum exploration" +optical (55,100), "petroleum exploration" +ultraviolet (1,950), "petroleum exploration" +"x-ray" (25,700), "petroleum exploration" +"soft x-ray" (14), "petroleum exploration" +"cosmic ray" (424), "petroleum exploration" +muon (479),
Terms: microhertz (20,900), millihertz (45,300), hertz (55,400,000), khz (61,000,000), mhz (225,000,000), ghz (167,000,000), thz (4,730,000), petahertz (117,000), infrared (136,000,000), optical (397,000,000), ultraviolet (46,700,000), "x-ray" (114,000,000), "soft x-ray" (1,180,000), "cosmic ray" (3,290,000), muon (184,000,000),
Boolean: "petroleum exploration" +gradiometer (738), "petroleum exploration" +gradiometry (649), "petroleum exploration" +gradiometers (60),
Terms: gradiometer (252,000), gradiometry (76,400), gradiometers (80,800),
Boolean: "petroleum exploration" +"phased array" (213), "petroleum exploration" +"phased arrays" (22), "petroleum exploration" +"beam steering" (24), "petroleum exploration" +"beam forming" (23),
Terms: phased array (1,870,000), phased arrays (172,000), beam steering (344,000), beam forming (519,000),
Boolean: "petroleum exploration" +magnetometry (531), "petroleum exploration" +magnetometers (1,150), "petroleum exploration" +"magnetic gradiometer" (28),
Terms: magnetometry (355,000), magnetometers (1,030,000), magnetic gradiometer (19,900),
Boolean: "petroleum exploration" +microtesla (12), "petroleum exploration" +nanotesla (23), "petroleum exploration" +picotesla (3), "petroleum exploration" +femtotesla (0),
Terms: microtesla (142,000), nanotesla (107,000), picotesla (22,800), femtotesla (11,200), attotesla (2,160),
Boolean: "petroleum exploration" +microgal (20), "petroleum exploration" +nanogal (2), "petroleum exploration" +picogal (0), "petroleum exploration" +femtogal (0),
Terms: microgal (16,900), nanogal (1,860), picogal (79), femtogal (5), attogal (6),